Crossword Genius

So certain fuss will come from this peevish state (13)

Ross

I believe the answer is:

fractiousness

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

'peevish state' is the definition.
(I know this)

'so certain fuss will come from' is the wordplay.
'so certain fuss' anagrams to 'FRACTIOUSNESS'.
However, I'm not clear how this is indicated.

'this' is the link.

Can you help me to learn more?

(Another definition for fractiousness that I've seen is " Irritability".)

I've seen this clue in The Irish Independent.
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