Shouts for more fiery effect (7)

I believe the answer is:
bellows
'shouts' is the definition.
(bellow is a kind of shout)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(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" .)
