Crossword Genius

Drive and change oil in sump (9)

Ross

I believe the answer is:

impulsion

'drive' is the definition.
(impulsion is a kind of drive)

'change oil in sump' is the wordplay.
'change' is an anagram indicator.
'oil'+'in'+'sump'='oilinsump'
'oilinsump' with letters rearranged gives 'IMPULSION'.

'and' is the link.

(Other definitions for impulsion that I've seen before include "Urge" , "Force" .)

I've seen this clue in The Guardian.
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