These people are a bad bet, sir (6)

I believe the answer is:

tribes

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'these people' is the definition.
The definition suggests an adverb but the answer is not.

'a bad bet sir' is the wordplay.
'a bad' indicates an anagram.
'bet'+'sir'='betsir'
'betsir' is an anagram of 'TRIBES'.

'are' acts as a link.

Can you help me to learn more?

(Other definitions for tribes that I've seen before include "Social groups in traditional societies" , "Communities of primitive or nomadic groups" , "Groups of people related by blood" , "races" , "Groups of families in traditional societies" .)

I've seen this clue in the Evening Standard.

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