Sing drunkenly outside the inn (4)

I believe the answer is:

sign

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'outside the inn' is the definition.
I can't judge whether this defines the answer.

'sing drunkenly' is the wordplay.
'drunkenly' indicates anagramming the letters.
'sing' with letters rearranged gives 'SIGN'.

Can you help me to learn more?

(Other definitions for sign that I've seen before include "house" , "Token - symbol - omen - write one's name" , "Public notice; portent" , "Indicator" , "part of the zodiac" .)

I've seen this clue in the Evening Standard.

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