Coot's restrained by doctor - one with kinky intentions? (4)

I believe the answer is:

gimp

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'coot's restrained by doctor one with kinky intentions?' is the definition.
I can't tell whether this definition defines the answer.

'coot's restrained by doctor' is the wordplay.
'coot's' becomes 'I'm' (I am - where the crossword setter is 'Coot').
'restrained by' means one lot of letters goes inside another.
'doctor' becomes 'gp' (general practitioner).
'im' inserted into 'gp' is 'GIMP'.

Can you help me to learn more?

I've seen this clue in The Independent.

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