Crossword Genius

Choosing to work with metal key (6)

Ross

I believe the answer is:

opting

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'choosing' is the definition.
(I've seen this before)

'work with metal key' is the wordplay.
'work with' becomes 'op' (abbreviation for opus. I am not sure about the 'with' bit.).
'metal' becomes 'tin' (tin is a kind of metal).
'key' becomes 'g' (musical key).
'op'+'tin'+'g'='OPTING'

'to' acts as a link.

Can you help me to learn more?

(Another definition for opting that I've seen is " 'Choosing, plumping (6)'".)

I've seen this clue in The Mirror.
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