Crossword Genius

Unfasten the duck cage (4)

Ross

I believe the answer is:

open

'unfasten' is the definition.
(thesaurus)

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

(Other definitions for open that I've seen before include "such a verdict?" , "With which to offer hearty welcome" , "'Frank, not secret (4)'" , "unsealed" , "Traditional room heater" .)

I've seen this clue in The Telegraph.
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