Crossword Genius

Detective is apprehending male engaged in climbing tree (6)

Ross

I believe the answer is:

wimsey

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

'detective' is the definition.
(Lord Peter Wimsey in novels by Dorothy L Sayers)

'is apprehending male engaged in climbing tree' is the wordplay.
I cannot really see how this works, but
'male' could be 'm' (common abbreviation) and 'm' is found in the answer.
'is' is found in the answer.
The remaining letters 'wey' 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?

(Other definitions for wimsey that I've seen before include "detective" , "Lord Peter ------, Dorothy L Sayers' creation" .)

I've seen this clue in The Independent.
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