Crossword Genius

Is obliged to (4)

Ross

I believe the answer is:

must

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

This is the entire clue.

(Other definitions for must that I've seen before include "The mould is compelled" , "Unfermented wine" , "The imperative for mould" , "Grape juice ready for fermentation" , "Prerequisite" .)

I've seen this clue in The Mirror, the Evening Standard and The Times.
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