Foresee a month going over ancient city (5)

I believe the answer is:

augur

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'foresee' is the definition.
(thesaurus)

'month going over ancient city' is the wordplay.
'month' becomes 'aug' (Aug is an example).
'going over' means one lot of letters go next to another.
'ancient city' becomes 'ur'.
'aug'+'ur'='AUGUR'

'a' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for augur that I've seen before include "Portend, foretell" , "A guru (anag)" , "Harbinger" , "Portend, herald" , "Bode; soothsayer" .)

I've seen this clue in The Times.

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