Agreement to contain fight in settlement (8)

I believe the answer is:

defrayal

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'settlement' is the definition.
(I've seen this before)

'agreement to contain fight in' is the wordplay.
'agreement' becomes 'deal' (deal is a kind of agreement).
'to contain' is an insertion indicator.
'fight in' becomes 'fray' (fray is a kind of fight. I am not sure about the 'in' bit.**).
'deal' placed around 'fray' is 'DEFRAYAL'.

Can you help me to learn more?

(Other definitions for defrayal that I've seen before include "The provision of money to pay expenses" , "Payment for cost" , "Settlement" .)

I've seen this clue in The Telegraph.

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