Travel business to ancient city is minute (7)
I believe the answer is:
tourism
'travel business' is the definition.
'tourism' can be an answer for 'business' (tourism is a kind of business). I'm unsure of the 'travel' bit.
'to ancient city is minute' is the wordplay.
'ancient city' becomes 'ur' (ancient Sumerian city state).
'minute' becomes 'm' (abbreviation).
'to'+'ur'+'is'+'m'='TOURISM'
Can you help me to learn more?
(Other definitions for tourism that I've seen before include "Industry involved in attracting and servicing visitors" , "Holiday travel business" , "travelling of people" , "Holiday industry" , "The business of providing services to visitors" .)