Sort of seat to fight for? (3)
I believe the answer is:
box
This could be a double definition.
'sort of seat' is the first definition.
'fight for?' is the second definition.
'box' can be an answer for 'fight' (boxing is a kind of fighting). I am not sure about the 'for?' bit.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for box that I've seen before include "Present container?" , "Christmas present" , "Engage in pugilism" , "Punch" , "Carton" .)