Crossword Genius

Very sweet Riesling, perhaps -- a few, not all, tucking in (7)

Ross

I believe the answer is:

winsome

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

'very sweet' is the definition.
'winsome' can be an answer for 'sweet' (thesaurus). I'm unsure of the 'very' bit.

'riesling perhaps a few not all tucking in' is the wordplay.
I cannot quite understand how this works, but
'few' could be 'some' (associated in meaning) and 'some' is located in the answer.
'in' is within the answer.
A single letter 'w' remains 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 winsome that I've seen before include "Captivating" , "Charming (in a childlike way?)" , "Holding an appeal" , "Attractive - I'm so new (anag)" , "Agreeable" .)

I've seen this clue in The Telegraph.
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