Pantry is apparently not yet full (9)

I believe the answer is:

stillroom

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'pantry' is the definition.
(stillroom is a kind of pantry)

'yet full' is the wordplay.
'yet' becomes 'still' (synonyms).
'full' becomes 'room' (I can't justify this - if you can you should give a lot more credence to this answer).
'still'+'room'='STILLROOM'

'is apparently not' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

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

I've seen this clue in The Irish Independent and The Irish News.

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