Semi-docile professional person (3)

I believe the answer is:

doc

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'professional person' is the definition.
(doc is a kind of professional person)

I can't explain the remainder of the clue.

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(Other definitions for doc that I've seen before include "Disney dwarf" , "Medical practitioner (abbr)" , "bones" , "scaled-down version of GP" , "Consultant" .)

I've seen this clue in the Evening Standard.

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