Crossword Genius

Good man rebuilt a crock - for racing? (5,3)

Ross

I believe the answer is:

stock car

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

'racing?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'good man rebuilt a crock' is the wordplay.
'good man' becomes 'st' (abbreviation for saint).
'rebuilt' indicates an anagram.
'a'+'crock'='acrock'
'acrock' with letters rearranged gives 'ockcar'.
'st'+'ockcar'='STOCK-CAR'

'for' is the link.

Can you help me to learn more?

(Other definitions for stock car that I've seen before include "Type of racing" , "Production-line vehicle modified for racing" , "customised vehicle" , "Modified motor for racing and ramming" , "production saloon" .)

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