Which frames work for picture? (3,3)
I believe the answer is:
top hat
'picture?' is the definition.
(film ie motion picture)
'which frames work' is the wordplay.
'which' becomes 'that'.
'frames' is an insertion indicator.
'work' becomes 'op' (abbreviation for opus).
'that' enclosing 'op' is 'TOP-HAT'.
'for' acts as a link.
(Other definitions for top hat that I've seen before include "Formal headgear for man" , "Man's cylindrical headgear" , "Formal attire" , "Old film" , "Film starring Fred Astaire" .)