Farrier working for top end racer? (7)

I believe the answer is:

ferrari

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'racer?' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for ferrari that I've seen before include "Italian racing car company" , "Sports car brand" , "Italian sports car" , "Type of racing car" .)

I've seen this clue in The Times and The Sunday Times.

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