City worked up energy for game (8)
I believe the answer is:
lacrosse
'game' is the definition.
(lacrosse is a kind of game)
'city worked up energy' is the wordplay.
'city' becomes 'la' (Los Angeles).
'worked up' becomes 'cross' (both can mean irritated or angry).
'energy' becomes 'e' (physics symbol as in E=mc2).
'la'+'cross'+'e'='LACROSSE'
'for' is the link.
(Other definitions for lacrosse that I've seen before include "Like thirteen of the other clues in the French" , "Sport played with sticks" , "Game played with a netted stick" , "Ball game using netted stick" , "Game played with nets on sticks" .)