Crossword Genius

Large pantry not yet full? (9)

Ross

I believe the answer is:

stillroom

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

'large pantry' is the definition.

'not yet full?' is the wordplay.
I cannot quite see how this works, but
'not' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
'yet' could be 'still' (synonyms) and 'still' is located in the answer.
The remaining letters 'rom' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for stillroom that I've seen is " Pantry".)

I've seen this clue in The Times.
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