Young man from the right English valley (4)
I believe the answer is:
dale
'valley' is the definition.
(dale is a kind of valley)
'young man from the right english' is the wordplay.
'young man' becomes 'lad' (I've seen this before).
'from the right' shows that the letters should be reversed in order.
'english' becomes 'e' (abbreviation).
'lad' back-to-front is 'dal'.
'dal'+'e'='DALE'
(Other definitions for dale that I've seen before include "Valley; old radio soap family" , "depression" , "Up hill and down . . . ." , "Valley; man's name" , "See 8" .)