Trouble knitting a scarf (6)

I believe the answer is:

fracas

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

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

'knitting a scarf' is the wordplay.
'a scarf' anagrams to 'FRACAS'.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for fracas that I've seen before include "Brief quarrel" , "Free-for-all" , "Melee" , "Scrap" , "Dust-up" .)

I've seen this clue in The Globe and Mail.

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