Crossword Genius

What happens in 1066, avoiding king's disputed ground (2,4,4)

Ross

I believe the answer is:

no mans land

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'ground' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for no mans land that I've seen before include "Animal Farm?" , "unclaimed area" , "What separates the sides" , "Troops couldn't take it" , "Female country" .)

I've seen this clue in The Independent.
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