Crossword Genius

Drive? Sadly, time's up (7)

Ross

I believe the answer is:

impetus

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

'sadly time's up' is the wordplay.
'sadly' is an anagram indicator.
'times'+'up'='timesup'
'timesup' is an anagram of 'IMPETUS'.

(Other definitions for impetus that I've seen before include "Driving force, forward movement" , "Incentive - time's up (anag)" , "influence" , "Catalyst" , "Thrust" .)

I've seen this clue in The Everyman puzzle in The Observer.
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