Lower on a farm (3)

I believe the answer is:

cow

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

'lower' is the definition.
(something which lows - makes cow sounds)

I can't explain the remainder of the clue.

(Other definitions for cow that I've seen before include "Frighten with intimidations" , "Female farm animal" , "Subdue in bovine manner?" , "Intimidate, female ox" , "frighten as with threats" .)

I've seen this clue in the Evening Standard.

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