Crossword Genius

Impenetrable song offered by drunk (8)

Ross

I believe the answer is:

airtight

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

'song offered by drunk' is the wordplay.
'song' becomes 'air' (air can mean a piece of music).
'offered by' means one lot of letters go next to another.
'drunk' becomes 'tight' (slang term).
'air'+'tight'='AIRTIGHT'

(Other definitions for airtight that I've seen before include "beyond question" , "With no opening" , "Sure" , "not letting out a breath?" , "Firmly closed" .)

I've seen this clue in The Independent.
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