A PhD in clinical psychology would allow you to work in therapy and do research in Neuroscience. If that is your chosen direction, than doing a masters would not be useful, since that PhD would allow you to work as a therapist. In general, based on what you wrote here, doing a masters is likely not the best path to follow, unless your CV is on the weak side.
You should probably look at grad schools which have a strong research psychology program and a good neuroscience program.
Have you looked at potential grad schools yet?