Crossword Genius

Impetus, spur (8)

Ross

I believe the answer is:

stimulus

I believe this clue is a double definition.

'impetus' is the first definition.
(thesaurus)

'spur' is the second definition.
(I've seen this before)

(Other definitions for stimulus that I've seen before include "That which produces a response" , "Fillip" , "Spur or catalyst for action" , "Something provoking a reaction" , "Trigger" .)

I've seen this clue in The Guardian.
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