Incentives (7)
I believe the answer is:
stimuli
'incentives' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stimuli that I've seen before include "Promoters of activity" , "Incentives to action" , "They arouse to action" , "Things that rouse one to activity" , "Activity inducers" .)