Crossword Genius

Winter party cocktail? (8)

Ross

I believe the answer is:

snowball

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

'cocktail?' is the definition.
(I've seen this before)

'winter party' is the wordplay.
'winter' becomes 'snow' (I can't explain this - if you can you should believe this answer much more).
'party' becomes 'ball' (ball is a kind of party).
'snow'+'ball'='SNOWBALL'

Can you help me to learn more?

(Other definitions for snowball that I've seen before include "Cocktail; grow rapidly" , "Drink of advocaat and lemonade" , "Mushroom" , "It's thrown in winter fun (8)" , "A mixture of drugs" .)

I've seen this clue in The Independent.
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