Italian city where pesto originated (5)
I believe the answer is:
genoa
'italian city where pesto originated' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for genoa that I've seen before include "Cake type; foresail" , "NW Italian sea port" , "North Italian port" , "Italian city has no age, oddly" , "Italian city; sail" .)