Organ with a lobe (3)
I believe the answer is:
ear
'organ with a lobe' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ear that I've seen before include "It's used in hearing" , "Aural organ" , "one hears" , "Speculator ignoring British" , "'Give every man thine ..., but few thy voice'/Hamlet" .)