Fight for seats at the theatre? (3)
I believe the answer is:
box
'fight' is the definition.
(boxing is a kind of fighting)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for box that I've seen before include "Carton" , "Present container?" , "Punch" , "Tackle defender" , "Fight; tree; container" .)