Crossword Genius

Mouldy smell caused commotion, so to speak (4)

Ross

I believe the answer is:

fust

'mouldy smell' is the definition.
(a musty or mouldy smell)

'caused commotion so to speak' is the wordplay.
'caused commotion' becomes 'fussed'.
'so to speak' indicates a 'sounds like' (homophone) clue.
'fussed' is a homophone of 'FUST'.

(Another definition for fust that I've seen is " Mould".)

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