Going without Oscar, bad actor needed material (7)
I believe the answer is:
gingham
'material' is the definition.
(I know that gingham is a type of material)
'going without oscar bad actor' is the wordplay.
'without' indicates named letters should be taken away.
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'bad actor' becomes 'ham' (a ham is someone who overacts).
'going' with 'o' taken out is 'ging'.
'ging'+'ham'='GINGHAM'
'needed' acts as a link.
(Other definitions for gingham that I've seen before include "Light cotton checked fabric" , "Lightweight cotton fabric" , "Cotton cloth woven with coloured checks" , "Fabric in a plaid weave" , "Lightweight cotton cloth" .)