Crossword Genius

Drive time's up unfortunately (7)

Ross

I believe the answer is:

impetus

'drive' is the definition.
(impetus is a drive to do something)

'time's up unfortunately' is the wordplay.
'unfortunately' is an anagram indicator (a bad or unfortunate spelling).
'times'+'up'='timesup'
'timesup' is an anagram of 'IMPETUS'.

(Other definitions for impetus that I've seen before include "Driving force, momentum" , "Motivation" , "Incentive - time's up (anag)" , "influence" , "Momentum, stimulus" .)

I've seen this clue in The Irish Times.
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