Crossword Genius

A vessel to sup from (5)

Ross

I believe the answer is:

stoup

I'm a little stuck... Click here to teach me more about this clue!

'a vessel' is the definition.
(stoup is a kind of vessel)

'to sup from' is the wordplay.
'to sup' anagrams to 'STOUP'.
Though, I'm unsure how this is indicated.

Can you help me to learn more?

(Another definition for stoup that I've seen is " Basin for holy water".)

I've seen this clue in the Evening Standard.
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