15across Bang! Bang! Bang! Bang! Bang! Enough to get a fight fixed (4,6)
F?V? ?O?N?S
4down "Let's have a go!" goes Don Quixote (4) ?I?T
19down Decisive input in closing argument (5,3) F?N?L ?A?
26down Six of one from the 25th? Done (4) O?E?
It is a very ambiguous clue.If fixed means to illegally decide the outcome then a payment would be required i.e five pounds.If fixed means to decide the winner then five rounds would be appropriate. However I cannot equate points with bangs which the five refers to.