Crossword Genius

Has to have a mould (4)

Ross

I believe the answer is:

must

I believe this clue is a triple definition!

'has to' is the first definition.
(I've seen this before)

'have' is the second definition.
('must' can be a synonym of 'have')

'a mould' is the third definition.
(I've seen this before)

(Other definitions for must that I've seen before include "Smell of dampness or staleness" , "The mould is compelled" , "Mouldiness" , "Essential to have" , "Prerequisite" .)

I've seen this clue in the Evening Standard.
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