Crossword Genius

Round trip to ancient town (4)

Ross

I believe the answer is:

tour

I'm a little stuck... Click here to teach me more about this clue!

'round trip' is the definition.
(I've seen this before)

'to ancient town' is the wordplay.
'ancient town' becomes 'ur' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to'+'ur'='TOUR'

Can you help me to learn more?

(Other definitions for tour that I've seen before include "Entertainer's itinerary" , "Journey to visit places of interest" , "Pleasure trip going from place to place" , "Spell of military duty" , "Pastoral people of East Africa" .)

I've seen this clue in The Globe and Mail.
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