Postgraduate's project (6)
I believe the answer is:
thesis
'postgraduate's project' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for thesis that I've seen before include "Dissertation presented for a doctorate" , "Researched dissertation" , "writing following research" , "Proposition" , "He sits (anag) - treatise" .)