Picnic intruders (4)

I believe the answer is:

ants

'picnic intruders' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ants that I've seen before include "Soldiers" , "They live in a formicary" , "Tiny insects that live in colonies" , "Termites" , "24 [INSECT] s" .)

I've seen this clue in The Star Tribune and the King Feature Syndicate.

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