Crossword Genius

Bert is upset by lots of people (6)

Ross

I believe the answer is:

tribes

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

'lots of people' is the definition.
The answer and definition can be both groups as well as being plural nouns.
Perhaps you can see an association between them that I can't see?

'bert is upset' is the wordplay.
'upset' is an anagram indicator.
'bert'+'is'='bertis'
'bertis' anagrammed gives 'TRIBES'.

'by' is the link.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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