“Puffers”, one cries (7)
I believe the answer is:
Here is my best explanation:
This clue might be a double definition.
'puffers' is the first definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.
'one cries' is the second definition.
(bellow is a kind of cry)
(Other definitions for bellows that I've seen before include "Instrument for creating a stream of air", "Wind pump; shouts", "Air blower for fire", "Shouts loudly", "Roars at part of the organ", "Shouts; an air-pump", "sings very loudly", "camera part", "Fan of fire" and "Device supplying an organ with air".)