A type of ant, I gather (9)

I believe the answer is:

harvester

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

'a type of ant' is the definition.
(harvester ant is a type of ant)

I don't understand the remainder of the clue.

(Other definitions for harvester that I've seen before include "Reaping-machine" , "Long-legged spider" , "One gathering in crops" , "Crop gatherer" , "Farm worker" .)

I've seen this clue in The Times.

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