Crossword Genius

In which kid, after climbing, retired? (6)

Ross

I believe the answer is:

garret

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

'in' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'kid after climbing retired?' is the wordplay.
'kid' becomes 'rag' (both can mean to tease).
'after' means one lot of letters go next to another.
'climbing' becomes 'ter' (I can't justify this - if you can you should give a lot more credence to this answer).
'retired?' is a reversal indicator.
'rag' after 'ter' is 'terrag'.
'terrag' reversed gives 'GARRET'.

'which' acts as a link.

Can you help me to learn more?

(Other definitions for garret that I've seen before include "Dingy attic room" , "Kind of attic associated with impoverished artist" , "Room for starving artist?" , "poor room" , "Upper chamber" .)

I've seen this clue in The Independent.
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