Loud budgerigar is hushed? Not entirely (6)
I believe the answer is:
garish
'loud' is the definition.
(I know that loud can be written as garish)
'budgerigar is hushed? not entirely' is the wordplay.
'not entirely' says the answer is hidden in the clue.
'GARISH' is hidden within 'budgerigar is hushed'.
(Other definitions for garish that I've seen before include "Overly ostentatious" , "Excessively bright, over-colourful (6)" , "Showy, lurid" , "Crudely bright" , "Gaudy, vulgarly bright" .)