Eleven in sci-fi film finding way out (4)
I believe the answer is:
exit
'way out' is the definition.
('exit' can be a synonym of 'way out')
'eleven in sci-fi film' is the wordplay.
'eleven' becomes 'xi' (roman numeral).
'in' is an insertion indicator.
'sci-fi film' becomes 'et' (I've seen this in other clues).
'xi' going within 'et' is 'EXIT'.
'finding' acts as a link.
(Other definitions for exit that I've seen before include "Withdrawal" , "Sudden rush of pleasure" , "Way to go!" , "Player's departure" , "Road leaving motorway" .)