Old city bloke left Derby finally as a top priority (8)

I believe the answer is:

urgently

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'as a top priority' is the definition.
I can't judge whether this defines the answer.

'old city bloke left derby finally' is the wordplay.
'old city' becomes 'ur' (ancient Sumerian city state).
'bloke' becomes 'gent' (both can mean a man).
'left' becomes 'l' (common abbreviation).
'finally' indicates one should take the final letters.
The last letter of 'derby' is 'y'.
'ur'+'gent'+'l'+'y'='URGENTLY'

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(Other definitions for urgently that I've seen before include "with haste" , "as quickly as possible?" , "Pressingly" , "without delay" , "With speedy attention" .)

I've seen this clue in The Times.

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