Craze for loud commercial (3)
I believe the answer is:
fad
'craze' is the definition.
('fad' can be a synonym of 'craze')
'loud commercial' is the wordplay.
'loud' becomes 'f' (A musical term**).
'commercial' becomes 'ad'.
'f'+'ad'='FAD'
'for' is the link.
(Other definitions for fad that I've seen before include "Passionate interest" , "A craze, usually passing" , "Personal whim" , "Short-lived craze" , "transient success" .)