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Hot drinks or dry Rieslings? (4,6)

Ross

I believe the answer is:

sour grapes

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'hot drinks or' is the definition.
I can't tell whether this definition defines the answer.

'dry rieslings?' is the wordplay.
'dry' becomes 'sour' (associated in meaning).
'rieslings?' becomes 'grapes' (riesling is a kind of grape).
'sour'+'grapes'='SOUR GRAPES'

Can you help me to learn more?

(Other definitions for sour grapes that I've seen before include "Belittlement" , "Feigned dislike" , "Curmudgeonly attitude" , "Disparagement of something one wants but cannot attain" , "Jealous resentment" .)

I've seen this clue in The Everyman puzzle in The Observer.
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