He thrives on complaints (6)

I believe the answer is:

doctor

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'he thrives on complaints' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is the entire clue.

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(Other definitions for doctor that I've seen before include "Adulterate; medic" , "One treats the ill" , "An apple a day keeps him away" , "Medic or holder of highest university degree" , "Who perhaps" .)

I've seen this clue in The Globe and Mail.

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