Vegetables certain rustics link with ants? (4)

I believe the answer is:

peas

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

'vegetables' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for peas that I've seen before include "birds" , "pulse" , "Seeded vegetables" , "Podded vegetables" , "Vegetables from pods" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app