Possibly flies in groups (7)

I believe the answer is:

insects

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'possibly flies' is the definition.
(I know that Gnats is a type of insects)

'in groups' is the wordplay.
'groups' becomes 'sects' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in'+'sects'='INSECTS'

Can you help me to learn more?

(Other definitions for insects that I've seen before include "Bees, flies, etc." , "crawlers, perhaps" , "Small arthropods" , "Six-leggged creatures" , "Considerable class" .)

I've seen this clue in The Guardian and The Globe and Mail.

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