Leave film around eleven (4)
I believe the answer is:
exit
'leave' is the definition.
(I know that leave can be written as exit)
'film around eleven' is the wordplay.
'film' becomes 'ET' (E.T. the Extra-Terrestrial).
'around' indicates putting letters inside.
'eleven' becomes 'xi' (Roman numerals).
'et' placed around 'xi' is 'EXIT'.
(Other definitions for exit that I've seen before include "Way to leave" , "Road leaving motorway" , "walk away" , "Leave the building" , "Relinquish the lead" .)