Revolting tribesmen turned in after murder (5)

I believe the answer is:

iceni

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'revolting tribesmen' is the definition.
'iceni' can be an answer for 'tribesmen' (I've seen this before). I'm unsure of the 'revolting' bit.

'turned in after murder' is the wordplay.
'turned' shows that the letters should be reversed in order.
'after' says to put letters next to each other.
'murder' becomes 'ice' (slang term).
'in' written backwards gives 'ni'.
'ni' after 'ice' is 'ICENI'.

Can you help me to learn more?

(Other definitions for iceni that I've seen before include "Old warriors" , "people rebelling against Rome" , "British people once" , "Queen Boudicca's people" , "Boudicca's tribe" .)

I've seen this clue in The Independent.

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