Crossword Genius

Unlock duck coop (4)

Ross

I believe the answer is:

open

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

'duck coop' is the wordplay.
'duck' becomes 'o'.
'coop' becomes 'pen' (I've seen this before).
'o'+'pen'='OPEN'

(Other definitions for open that I've seen before include "ready to entertain new ideas" , "Willing" , "Traditional room heater" , "Overt" , "Not closed or obstructed" .)

I've seen this clue in The Telegraph.
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