Crossword Genius

In-form professional? (13)

Ross

I believe the answer is:

schoolteacher

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'professional?' is the definition.
(schoolteacher is a kind of professional)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for schoolteacher that I've seen before include "Master, say" , "Instructor" , "tutor" , "Chips perhaps" , "who has class?" .)

I've seen this clue in The Telegraph.
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