Drinks up in ship (4)

I believe the answer is:

sups

'drinks' is the definition.
(to sup is to drink)

'up in ship' is the wordplay.
'in' indicates putting letters inside.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'up' placed within 'ss' is 'SUPS'.

(Another definition for sups that I've seen is " Drinks".)

I've seen this clue in The Irish News.

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