Cocktail of lemonade and advocaat (8)

I believe the answer is:

snowball

(Other definitions for snowball that I've seen before include "Icy projectile" , "Increase in importance" , "kind of bush with white flowers" , "Quickly get bigger" , "Cold missile - advocaat and lemonade cocktail" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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