Academic recruiting scholarships are basically any scholarships awarded on academic merit (not based on diversity, athletics etc...).
According to the National Merit Scholarship organization website, Clemson offers three scholarships to national merit scholar finalists so your son may be eligible for this if he is indeed a finalist.
From the financial aid website (
Scholarships) on academic recruiting scholarships
"Academic recruiting scholarships are highly competitive and are awarded to entering freshmen on the basis of their admissions applications, beginning in the fall. A financial aid application is not required.
These scholarships are renewable for an additional three years of continuous undergraduate study for students who continue to meet the minimum prescribed academic criteria. The criteria are usually a cumulative 3.0 GPR and a minimum of 12 credits completed each semester. Academic standing will be monitored at the end of each semester in January and May. Recipients who do not meet the scholarship criteria for renewal may make up their deficiencies in summer school and submit a letter of appeal.
Academic recruiting scholarships awarded to out-of-state residents may include a companion Out-of-State Tuition Scholarship that covers part or all or of the out-of-state tuition and fee differential unless otherwise noted. The Out-of-State Tuition Scholarship is only available during periods of enrollment during which the recipient is eligible to receive the recruiting scholarship stipend. Stipends indicated in the scholarship listing are maximums. Awards may be reduced due to funding or other aid awarded.
Students who wish to be considered for Academic Recruiting Scholarships should apply for admissions by December 1 and complete the admissions process by December 31.
Renewable scholarships are reviewed each year and can be renewed only for three additional years of continuous undergraduate study.
Renewable scholarships are not renewed automatically; consideration will be given for scholarship continuation based on all eligibility requirements, other aid awarded and available funding.
Continued eligibility is dependent on the eligibility criteria established for each scholarship, including the minimum GPR requirement and the satisfactory completion of 12 credits per semester. Unless otherwise noted, a minimum cumulative 3.0 GPR is required for renewal of Academic Recruiting Scholarships. Academic standing will be monitored in May at the end of the academic year."