Shouts for more fiery effect (7)

I believe the answer is:

bellows

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'shouts' is the definition.
(bellow is a kind of shout)

I cannot understand how the rest of the clue works.

(Other definitions for bellows that I've seen before include "sings very loudly" , "Fire fanner for Boswell" , "Air blower for fire" , "Accordion part" , "Shouts loudly" .)

I've seen this clue in the Evening Standard.

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