Crossword Genius

Spur is sharp (6)

Ross

I believe the answer is:

prompt

This clue is a double definition.

'spur' is the first definition.
(thesaurus)

'sharp' is the second definition.
(thesaurus)

'is' acts as a link.

(Other definitions for prompt that I've seen before include "Immediate - supply forgotten words" , "Immediate - supply actor's lines" , "effective in expedition" , "Ready" , "Punctual; instigate" .)

I've seen this clue in The Times.
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