Certain insects get military workers (4,4)

I believe the answer is:

army ants

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'certain insects' is the definition.
'army ants' can be an answer for 'insects' (army ant is a kind of insect). I'm not sure about the 'certain' bit.

'get military workers' is the wordplay.
'get' says to put letters next to each other.
'military' becomes 'army' (the armed forces).
'workers' becomes 'ants' (worker ants).
'army' next to 'ants' is 'ARMY ANTS'.

Can you help me to learn more?

(Other definitions for army ants that I've seen before include "Insects moving in large groups" , "Foraging insects" .)

I've seen this clue in the Sydney Morning Herald.

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