Legendary builder who redeveloped our slum (7)
I believe the answer is:
romulus
'legendary builder' is the definition.
The definition suggests a singular noun which matches the answer.
'redeveloped our slum' is the wordplay.
'redeveloped' is an anagram indicator.
'our'+'slum'='ourslum'
'ourslum' is an anagram of 'ROMULUS'.
'who' is the link.
Can you help me to learn more?
(Other definitions for romulus that I've seen before include "One brother founding Rome" , "Fratricide" , "Brother of 25 across" , "Founder of Rome from our slum" , "Twin founder of city" .)