Morning person builds city (5)
I believe the answer is:
amman
'builds city' is the definition.
'amman' can be an answer for 'city' (Amman is an example). I'm unsure of the 'builds' bit.
'morning person' is the wordplay.
'morning' becomes 'am'.
'person' becomes 'man' (man is a kind of person).
'am'+'man'='AMMAN'
Can you help me to learn more?
(Other definitions for amman that I've seen before include "Jordanian capital" , "Asian capital" , "Jordanian city" , "Middle East capital" , "A capital f-fellow in Jordan?" .)