Crossword Genius

Outspoken man in spring letting off steam (6)

Ross

I believe the answer is:

geyser

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'steam' is the definition.
(thesaurus)

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(Other definitions for geyser that I've seen before include "It blows off steam" , "one named Old Faithful" , "spouter!" , "Steaming spring" , "upsurge" .)

I've seen this clue in The Sunday Times and The Times.
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