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One of the winemaker's needs (4)

Ross

I believe the answer is:

must

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'one of the winemaker's needs' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?

'one of the' is the wordplay.
'one of' becomes 'mus' (I can't explain this - if you can you should give a lot more credence to this answer).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'mus'+'t'='MUST'

Can you help me to learn more?

(Other definitions for must that I've seen before include "Necessity" , "Smell of dampness or staleness" , "Prerequisite" , "new wine" , "Mouldiness" .)

I've seen this clue in the Evening Standard.
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