Puzzling polemic put together (7)
I believe the answer is:
compile
'put together' is the definition.
('compile' can be a synonym of 'put together')
'puzzling polemic' is the wordplay.
'puzzling' indicates anagramming the letters.
'polemic' anagrammed gives 'COMPILE'.
(Other definitions for compile that I've seen before include "Marshal" , "Polemic (anag.)" , "Assemble (a collection)" , "Put together" .)