Crossword Genius

Fine doctor cuts man loose after adapting carpenter's tool (9,5)

Ross

I believe the answer is:

smoothing plane

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

'tool' is the definition.
(smoothing plane is a kind of tool)

'fine doctor cuts man loose after adapting carpenter's' is the wordplay.
I cannot quite understand how this works, but
'fine' could be 'smooth' (similar in meaning) and 'smooth' is found within the answer.
'doctor' could be 'gp' (general practitioner) and 'gp' is found within the answer.
'man' could be 'lane' and 'lane' is found in the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.
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