Travel to an ancient city (4)

I believe the answer is:

tour

'travel' is the definition.
(touring is a kind of travelling)

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

(Other definitions for tour that I've seen before include "Journey around" , "Rout on excursion" , "Drive" , "A trip round" , "Journey visiting several different places" .)

I've seen this clue in the Evening Standard.

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