Loud object is appropriate (3)
I believe the answer is:
fit
'appropriate' is the definition.
('fit' can be similar in meaning to 'appropriate')
'loud object' is the wordplay.
'loud' becomes 'f' (A musical term).
'object' becomes 'it' (pronoun for an inanimate object**).
'f'+'it'='FIT'
'is' acts as a link.
(Other definitions for fit that I've seen before include "Sudden attack,of coughing say" , "Match" , "Adapt; well" , "Suitable; sudden attack" , "Healthy; conform to" .)