No Welsh leader in wealthy English city (7)
I believe the answer is:
norwich
'english city' is the definition.
(I've seen this before)
'no welsh leader in wealthy' is the wordplay.
'leader' suggests taking the first letters.
'in' indicates putting letters inside.
'wealthy' becomes 'rich' (similar in meaning).
The first letter of 'welsh' is 'w'.
'w' going within 'rich' is 'rwich'.
'no'+'rwich'='NORWICH'
(Other definitions for norwich that I've seen before include "Administrative centre of Norfolk" , "English city" , "E. Anglian county town" , "Juliana of - (Revelations of Divine Love)" , "County town of Norfolk" .)