Crossword Genius

Key at home in receptacle (3)

Ross

I believe the answer is:

bin

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

'key at home' is the wordplay.
'key' becomes 'b' (eg B major, musical key).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'b'+'in'='BIN'

'in' acts as a link.

(Other definitions for bin that I've seen before include "Storage receptacle" , "Domestic receptacle for rubbish" , "Common receptacle for household waste" , "Household rubbish is placed in it" , "Storage container" .)

I've seen this clue in The Mirror.
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