Said to come from Aurora Leigh (4)
I believe the answer is:
oral
'said' is the definition.
(I've seen this in another clue)
'come from aurora leigh' is the wordplay.
'come from' indicates a hidden word (I've seen 'coming from' mean this).
'ORAL' is hidden within 'aurora leigh'.
'to' is the link.
(Other definitions for oral that I've seen before include "Like some tradition" , "Vocal test" , "Unwritten examination" , "Spoken test" , "Via the mouth" .)