Other set wins fight in court? (7,3)
I believe the answer is:
witness box
'in court?' is the definition.
(I know that witness box is part of court)
'other set wins fight' is the wordplay.
'other' is an anagram indicator.
'fight' becomes 'box' (boxing is a kind of fighting).
'set'+'wins'='setwins'
'setwins' with letters rearranged gives 'witness'.
'witness'+'box'='WITNESS-BOX'
(Other definitions for witness box that I've seen before include "From where one testifies" , "Courtroom enclosure" , "Place for giving evidence" .)