Clan to run in riot in dark hours? (9)

I believe the answer is:

nocturnal

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

'dark hours?' is the definition.
(I've seen this before)

'clan to run in riot' is the wordplay.
'clan to run' can be anagrammed to 'NOCTURNAL'.
However, I am unsure how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for nocturnal that I've seen before include "Active after dark" , "Like bats" , "Relating to the night" , "happening at night" , "Night-time" .)

I've seen this clue in The Sun.

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