Comforter brought over to settle a heated quarrel (6)

I believe the answer is:

fracas

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'quarrel' is the definition.
(I know that fracas is a type of quarrel)

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

(Other definitions for fracas that I've seen before include "Uproar - brawl" , "Affray" , "Brawl, disturbance" , "Trouble" , "Melee" .)

I've seen this clue in The Guardian.

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