Crossword Genius

Groups causing near chaos at some stage? (6)

Ross

I believe the answer is:

genera

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

'groups' is the definition.
(more than one biological genus)

'near chaos at some stage?' is the wordplay.
I cannot quite see how this works, but
an anagram of 'near' is 'nera' which is within the answer.
The remaining letters 'ge' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'causing' acts as a link.

Can you help me to learn more?

(Other definitions for genera that I've seen before include "Orders with common characteristics" , "Biological groups" , "Groups with common characteristics" , "Sorts" , "Groups between family and species (biology)" .)

I've seen this clue in the Evening Standard.
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