John or Noel wandering round the East End (5)
I believe the answer is:
elton
'john' is the definition.
(musician Elton John)
'noel wandering round the east end' is the wordplay.
'wandering' is an anagram indicator.
'round' means one lot of letters goes inside another.
'end' says to take the final letters.
The final letter of 'east' is 't'.
'noel' with letters rearranged gives '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" .)