Clamorous voice for US variety (10)
I believe the answer is:
vociferous
'clamorous' is the definition.
(I know that clamorous can be written as vociferous)
'voice for us variety' is the wordplay.
'variety' indicates anagramming the letters.
'voice'+'for'+'us'='voiceforus'
'voiceforus' with letters rearranged gives 'VOCIFEROUS'.
(Other definitions for vociferous that I've seen before include "Insistently noisy" , "Strident" , "loud" .)