Crossword Genius

Form master at Windsor, perhaps? (4,10)

Ross

I believe the answer is:

turf accountant

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'form' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I can't see?

I can't explain the rest of the clue.

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(Other definitions for turf accountant that I've seen before include "you bet he wins!" , "bookmaker" .)

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