Marching insect (4,3)

I think it could be either:

Which length description are you looking for?:

4,3

army ant

'marching insect' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for army ant that I've seen before include "Foraging insect" , "Group-foraging insect" , "tropical insect" , "Stinging insect" , "Soldier, perhaps" .)

I've seen this clue in The Sun.

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