Loud vocalist mostly chilled (6)

I believe the answer is:

frappe

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

I don't understand the rest of the clue.

(Other definitions for frappe that I've seen before include "Like a cold drink" , "booze" , "Fruit drink frozen to a mush" , "Of a drink, served iced or chilled" , "Iced coffee drink" .)

I've seen this clue in The Telegraph.

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