Crossword Genius

... this chap (5)

Ross

I believe the answer is:

adair

I'm a little stuck... Click here to teach me more about this clue!

'this chap' is the definition.

'chap' is the wordplay.
I cannot really see how this works, but
'chap' could be 'ad' and 'ad' is located in the answer.
The remaining letters 'air' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for adair that I've seen is " Robin - - (old song)".)

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