Loud object is appropriate (3)
I believe the answer is:
fit
'appropriate' is the definition.
(similar in meaning)
'loud object' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'object' becomes 'it' (pronoun for an inanimate object).
'f'+'it'='FIT'
'is' is the 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" .)