Crossword Genius

Engenders excitement that doesn't leave unmoved (6,1,4)

Ross

I believe the answer is:

causes a stir

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

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

'engenders excitement' is the wordplay.
I cannot really understand how this works, but
'engenders' could be 'causes' (I've seen this in another clue) and 'causes' is located in the answer.
'excitement' 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 Evening Standard.
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