Impressive work by the bookmaker (7)

I believe the answer is:

tooling

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

'by the bookmaker' is the definition.
I can't tell whether this defines the answer.

'impressive work' is the wordplay.
I cannot quite understand how this works, but
'work' could be 'tool' (tooling is a kind of working) and 'tool' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for tooling that I've seen is " Leather, book, ornamenting".)

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

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