Stale and smelling of mould (5)

I believe the answer is:

musty

(Other definitions for musty that I've seen before include "Mouldy; stale-smelling" , "Smelling of mould" , "Stale and stuffy" , "Stale and dank" , "Mouldy; outdated" .)

I've seen this clue in the Sydney Morning Herald.

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