Crossword Genius

New wine is essential (4)

Ross

I believe the answer is:

must

I believe this clue is a double definition.

'new wine' is the first definition.
(I've seen this in another clue)

'essential' is the second definition.
(I know that must is a type of essential)

'is' is the link.

(Other definitions for must that I've seen before include "Prerequisite" , "The imperative for mould" , "Mould - grape juice during fermentation" , "Make off with (plane)" , "Essential to have" .)

I've seen this clue in The Sunday Times.
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