Loud (5)
'loud' is the definition.
(associated in meaning)
This is the entire clue.
(Other definitions for noisy that I've seen before include "ear-piercing maybe!" , "like thirteen [HARD ROCK]" , "Making much sound" , "Unpleasantly loud" , "Vociferous" .)
(Other definitions for brash that I've seen before include "Vulgarly self-assertive, impudent" , "loose broken rock" , "Cocky and tactless" , "Impertinent" , "forward" .)