Crossword Genius

Create fuss that won't leave people unmoved (5,1,4)

Ross

I believe the answer is:

cause a stir

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

'won't leave people unmoved' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'create fuss' is the wordplay.
I cannot quite understand how this works, but
'create' could be 'cause' (causing is a kind of creating) and 'cause' is found within the answer.
'fuss' could be 'stir' (synonyms) and 'stir' is located in the answer.
A single letter 'a' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

'that' acts as a link.

Can you help me to learn more?

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