More clamorous (7)
I believe the answer is:
noisier
'more clamorous' is the definition.
('noisy' can be similar in meaning to 'clamorous')
This is all the clue.
(Other definitions for noisier that I've seen before include "Perhaps more disturbing" , "Louder" , "More of a racket" , "Less quiet" , "more deafening!" .)