... incentives for everyone (within fixed limits) (7)
I believe the answer is:
stimuli
'incentives' is the definition.
(I've seen this in another clue)
'for everyone within fixed limits' is the wordplay.
'for everyone' becomes 'U' (Universal film certificate).
'within' is an insertion indicator.
'fixed' is an anagram indicator.
'limits' is an anagram of 'stimli'.
'u' put inside 'stimli' is 'STIMULI'.
(Other definitions for stimuli that I've seen before include "Things that cause a response" , "Promoters of activity" , "They arouse to action" , "Actions producing a response" , "Rousing influences" .)