Pictures a mince pie (6)
I believe the answer is:
cinema
'pictures' is the definition.
(I've seen this in another clue)
'a mince pie' is the wordplay.
'pie' indicates an anagram.
'a'+'mince'='amince'
'amince' with letters rearranged gives 'CINEMA'.
(Other definitions for cinema that I've seen before include "The big screen" , "Films, collectively" , "Movie house" , "(Building for) film" , "Movie theatre" .)