Mayor of Warsaw perhaps might have competitive advantage (4,8)
I believe the answer is:
pole position
'mayor' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for pole position that I've seen before include "best place to start" , "Starting place on race track, racing circuit, etc, on the inside at the front" , "Good starting-point for race" , "Advantageous starting place" , "First place" .)