Extra from EastEnders broadcast creates excitement (7)

I believe the answer is:

fervour

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

'excitement' is the definition.
(I know that excitement can be written as fervour)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for fervour that I've seen before include "Heat of emotion" , "Enthusiasm - excitement" , "Feelings of great warmth and intensity" , "Vehemence" , "Ardent intensity" .)

I've seen this clue in The Telegraph.

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