Old city fellow demands immediate action (6)

I believe the answer is:

urgent

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'old city fellow demands immediate action' is the definition.
I can't judge whether this defines the answer.

'old city fellow' is the wordplay.
'old city' becomes 'ur' (ancient city state).
'fellow' becomes 'gent' (I've seen this before).
'ur'+'gent'='URGENT'

Can you help me to learn more?

(Other definitions for urgent that I've seen before include "Requiring immediate action" , "In need of immediate action" , "Needing immediate action" , "Of immediate importance" , "Calling for immediate attention" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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