Metropolis of priority (3)
I believe the answer is:
rio
'metropolis' is the definition.
(Rio is an example)
'of priority' is the wordplay.
'of' indicates a hidden word.
'RIO' is hidden in the letters of 'priority'.
(Other definitions for rio that I've seen before include "old capital" , "... Grande, ... de Janeiro" , "Erstwhile home of Biggs" , "A Mexican river, may be grande" , "place of carnival" .)