Oscar is taken in by poet's committees (6)
I believe the answer is:
boards
'committees' is the definition.
(board is a kind of committee)
'oscar is taken in by poet's' is the wordplay.
'oscar' becomes 'o' (phonetic alphabet: alpha, bravo, charlie etc.).
'is taken in by' means one lot of letters goes inside another.
'poet's' becomes 'bards' (bard is a kind of poet).
'o' placed into 'bards' is 'BOARDS'.
(Other definitions for boards that I've seen before include "Adsorb (anag)" , "Committees or planks" , "Theatre stages" , "directors make them up" , "Tread them in the theatre" .)