Crossword Genius

Fiddles with some things in the workbox (7)

Ross

I believe the answer is:

chisels

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'fiddles' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for chisels that I've seen is " Carpenters' tools".)

I've seen this clue in the Evening Standard.
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