Loud, boisterous (5)
I believe the answer is:
noisy
This clue is a double definition.
'loud' is the first definition.
(associated in meaning)
'boisterous' is the second definition.
(similar in meaning)
(Other definitions for noisy that I've seen before include "ear-piercing maybe!" , "Loud, rackety" , "like thirteen [HARD ROCK]" , "Disturbingly loud" , "Clamorous" .)