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Forbids the low blows in fighting arena (8,5)

Ross

I believe the answer is:

bosworth field

I'm a little stuck... Click here to teach me more about this clue!

'fighting arena' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'forbids the low blows' is the wordplay.
'blows' indicates an anagram.
'forbids'+'the'+'low'='forbidsthelow'
'forbidsthelow' is an anagram of 'BOSWORTH FIELD'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for bosworth field that I've seen before include "Decisive Leicestershire battle of 1485" , "Site of battle" , "Site of Richard III's defeat and death in 1485" .)

I've seen this clue in The Independent.
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