Crossword Genius

Is obliged to (4)

Ross

I believe the answer is:

must

'is obliged to' is the definition.
(I've seen this in another clue)

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 Times, The Mirror and the Evening Standard.
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