Stand to finish quarrel, ignoring the odds (6)
I believe the answer is:
endure
'stand' is the definition.
('endure' can be a synonym of 'stand')
'finish quarrel ignoring the odds' is the wordplay.
'finish' becomes 'end' ('end' can be a synonym of 'finish'**).
'ignoring the odds' indicates alternate letters (letters in odd-numbered positions are removed).
The alternate letters of 'quarrel' are 'ure'.
'end'+'ure'='ENDURE'
'to' acts as a link.
(Other definitions for endure that I've seen before include "Bear, stick it out" , "Last or bear with courage" , "Put up with or withstand" , "Go through" , "Put up with something" .)