Round trip to ancient city (4)

I believe the answer is:

tour

'round trip' is the definition.
(thesaurus)

'to ancient city' is the wordplay.
'ancient city' becomes 'ur'.
'to'+'ur'='TOUR'

(Other definitions for tour that I've seen before include "Pleasure trip going from place to place" , "Journey visiting several different places" , "... de France is a multi-stage cycle race" , "Visit a number of places" , "Entertainer's itinerary" .)

I've seen this clue in The Guardian and The Telegraph.

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