Crossword Genius

Name a spare part for a historic model car (3)

Ross

I believe the answer is:

pat

I'm a little stuck... Click here to teach me more about this clue!

'name' is the definition.

'a spare part for a historic model car' is the wordplay.
I cannot quite understand how this works, but
'a' is within the answer.
'part' could be 'pt' (abbreviation) and 'pt' is found within the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for pat that I've seen before include "well-rehearsed" , "Portion of butter" , "Glib; touch affectionately" , "Conveniently; light touch" , "Gentle stroke of the hand with fluent repetition" .)

I've seen this clue in the Evening Standard.
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