Stars in a couple of films (3)
I believe the answer is:
leo
'stars' is the definition.
(constellation)
'in a couple of films' is the wordplay.
'in' indicates the answer is hidden within the clue.
'LEO' is hidden within 'couple of films'.
(Other definitions for leo that I've seen before include "Pope" , "born in July or August" , "of pride" , "5th sign of the zodiac" , "Cancer, ___, Virgo" .)