Standard spare part (3)

I believe the answer is:

par

'standard' is the definition.
(thesaurus)

'spare part' is the wordplay.
'part' indicates a hidden word.
'PAR' is hidden in the letters of 'spare'.

(Other definitions for par that I've seen before include "A number of golfing" , "Standard score for golfers" , "Regular score" , "Average standard" , "Normal level or standard" .)

I've seen this clue in the Evening Standard and The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.