Crossword Genius

Vessel's tiny mouth? (6)

Ross

I believe the answer is:

goblet

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

'vessel's' is the definition.
(thesaurus)

'tiny mouth?' is the wordplay.
I cannot quite see how this works, but
'mouth?' could be 'gob' (informal term for the mouth) and 'gob' is present in the answer.
The remaining letters 'let' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for goblet that I've seen before include "Large drinking cup" , "Large handleless drinking-cup" , "Bowl-shaped drinking vessel" , "small mouth?" , "Drinking-glass with stem and foot" .)

I've seen this clue in The Guardian.
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