Mentor (7)

I think it could be either:

adviser

teacher

'mentor' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for adviser that I've seen before include "ID saver (anag.)" , "Guide" , "Counseller" , "Counsellor, mentor" , "subject's specialist consultant" .)

I've seen this clue in the King Feature Syndicate.

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