Harangues a rising star out for a bit of fun (5)

I believe the answer is:

rants

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'harangues' is the definition.
('rant' can be a synonym of 'harangue')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for rants that I've seen before include "Noisily declaims" , "Raves" , "Loud pompous declamations" , "Loud bombastic declamations" .)

I've seen this clue in the Evening Standard.

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