Uncle's legendary twin? (5)
I believe the answer is:
remus
I believe this clue is a double definition.
'uncle's' is the first definition.
(I've seen this before)
'legendary twin?' is the second definition.
(I've seen this in another clue)
(Other definitions for remus that I've seen before include "Early city planner" , "City founder - "uncle" storyteller" , "Avuncular story-teller" , "partner in City foundation" , "One of the founders of Rome" .)