Demonstrates, besides, how serious they are about relatively minor diversions (9)

I believe the answer is:

sideshows

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'diversions' is the definition.
(sideshow is a kind of diversion)

'demonstrates besides how serious they are about relatively minor' is the wordplay.
'SIDESHOWS' is hidden in amongst the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for sideshows that I've seen before include "fairground attractions" , "Entertainments" .)

I've seen this clue in The Irish Times.

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