John or Noel wandering round the East End (5)
I believe the answer is:
elton
'john' is the definition.
(I've seen this before)
'noel wandering round the east end' is the wordplay.
'wandering' indicates an anagram.
'round' is an insertion indicator.
'end' suggests the final letters.
The last letter of 'east' is 't'.
'noel' is an anagram of 'elon'.
'elon' going around 't' is 'ELTON'.
'or' acts as a link.
(Other definitions for elton that I've seen before include "Let on he's John, the singer" , ". . . . . John (musician)" , "..... Jonn (musician)" , "- John, British singer" , "Sir - - John, singer songwriter" .)