Time's up, oddly, for incentive (7)
I believe the answer is:
impetus
'incentive' is the definition.
(thesaurus)
'time's up oddly' is the wordplay.
'oddly' indicates anagramming the letters.
'times'+'up'='timesup'
'timesup' is an anagram of 'IMPETUS'.
'for' is the link.
(Other definitions for impetus that I've seen before include "Momentum, stimulus" , "Driving force, momentum" , "Thrust" , "Imputes to force with which a body moves" , "Incentive - time's up (anag)" .)