Girl, quiet, to speak and fade away (9)

I believe the answer is:

evaporate

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

I cannot understand how the remainder of the clue works.

(Other definitions for evaporate that I've seen before include "Turn into vapour, lose moisture" , "Turn from liquid to vapour" , "Desiccate, dry up" , "let off steam" , "Turn liquid to gas" .)

I've seen this clue in The Sun.

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