Unhappy about street next to railway becoming wild (8)
I believe the answer is:
blustery
'wild' is the definition.
(thesaurus)
'unhappy about street next to railway' is the wordplay.
'unhappy' becomes 'blue' (I've seen this before**).
'about' means one lot of letters goes inside another.
'street' becomes 'st'.
'next to' is a charade indicator (letters next to each other).
'railway' becomes 'ry' (abbreviation for railway).
'blue' going around 'st' is 'bluste'.
'bluste'+'ry'='BLUSTERY'
'becoming' is the link.
(Other definitions for blustery that I've seen before include "Sly brute (anag)" , "Like wild weather" , "Somewhat windy" , "Blowing in fits and starts" , "Spasmodically windy" .)