Profited from Labour supporting Liberal intellectual (7)
I believe the answer is:
learned
'intellectual' is the definition.
(I know that intellectual can be written as learned)
'profited from labour supporting liberal' is the wordplay.
'profited from labour' becomes 'earned' (as in earning money for one's labour).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'liberal' becomes 'l' (abbreviation).
'earned' after 'l' is 'LEARNED'.
(Other definitions for learned that I've seen before include "Intellectual" , "Acquired and digested knowledge" , "Knowledgeable - scholarly" , "Literati" , "a word defining friend from Chambers?" .)