Wild hairstyle, with length trimmed, producing emotional outburst (8)

I believe the answer is:

hysteria

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

'emotional outburst' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for hysteria that I've seen before include "Overemotional state" , "Is hearty about losing the plot" , "emotional meltdown" , "display of wild emotion" , "Frenzied emotional state" .)

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app