Trendy light away from the coast (6)
I believe the answer is:
inland
'away from the coast' is the definition.
(I've seen this before)
'trendy light' is the wordplay.
'trendy' becomes 'in' ('in' can mean fashionable).
'light' becomes 'land' (light can mean to settle or land).
'in'+'land'='INLAND'
(Other definitions for inland that I've seen before include "Remote from the sea" , "Away from the shore" , "Remote from the 3 Dn" , "Away from 1 across" , "Away from the sea" .)