Crossword Genius

Pen shop (4)

Ross

I believe the answer is:

coop

I believe this is a double definition.

'pen' is the first definition.
(I've seen this before)

'shop' is the second definition.
(short for The Co-operative Group)

(Other definitions for coop that I've seen before include "Store" , "box of chickens" , "Birdcage" , "Cage for poultry" , "pound" .)

I've seen this clue in the Independent.
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