Brief movie role (5)
I believe the answer is:
cameo
'brief movie role' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cameo that I've seen before include "E. Med. nation" , "Short performance" , "Ornament or miniature performance" , "Brooch with an engraving in low relief" , "Piece of jewellery with carved portrait" .)