Crossword Genius

Firm to work in hutch (4)

Ross

I believe the answer is:

coop

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

'hutch' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'firm to work' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'to work' becomes 'op' (abbreviation for opus).
'co'+'op'='COOP'

'in' is the link.

Can you help me to learn more?

(Other definitions for coop that I've seen before include "Store" , "Birdcage" , "Cage for poultry" , "pound" , "Hens in this" .)

I've seen this clue in The Mirror.
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