Trend is loud nowadays (3)
I believe the answer is:
fad
'trend' is the definition.
(a fad is a brief craze or fashion)
'loud nowadays' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'nowadays' becomes 'AD' (AD, Anno Domini, as opposed to BC, Before Christ).
'f'+'ad'='FAD'
'is' is the link.
(Other definitions for fad that I've seen before include "Passing craze or peculiar notion" , "'Craze, all the rage (3)'" , "A passing fancy or fashion" , "A passing liking or fashion" , "Craze; idiosyncrasy" .)