Fighting sport (6)

I believe the answer is:

rowing

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'fighting sport' is the definition.
'rowing' can be an answer for 'sport' (rowing is a kind of sport). I'm unsure of the 'fighting' bit.

'fighting sport' is the wordplay.
'fighting' becomes 'row'.
'sport' becomes 'ing' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'row'+'ing'='ROWING'

Can you help me to learn more?

(Other definitions for rowing that I've seen before include "in dispute" , "Sculling sport?" , "Steven Redgrave's sport" , "Using oars" , "Olympic sport; arguing" .)

I've seen this clue in The Telegraph.

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