More excited by Caesar’s city (4)
I believe the answer is:
rome
'caesar's city' is the definition.
(I've seen this in another clue)
'more excited' is the wordplay.
'excited' indicates an anagram.
'more' with letters rearranged gives 'ROME'.
'by' acts as a link.
(Other definitions for rome that I've seen before include "Colosseum city" , "Capital city" , "Seat of Italian empire" , "church" , "The Eternal City" .)