Clash between boxers perhaps that Sky would stage? (8)

I believe the answer is:

dogfight

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'that sky would stage?' is the definition.
(dogfight can mean a military air battle)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for dogfight that I've seen before include "Canine conflict or combat between fighter planes" , "Aerial combat between fighter planes of canine origin" , "Aircraft battle" , "Conflict in the air" , "Close combat between fighter airplanes" .)

I've seen this clue in The Telegraph.

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