Are about organ (3)
I believe the answer is:
ear
'organ' is the definition.
(the ear is an organ)
'are about' is the wordplay.
'about' is an anagram indicator.
'are' with letters rearranged gives 'EAR'.
(Other definitions for ear that I've seen before include "Sense organ" , "Attention; seed head" , "Attention; an organ" , "Part of corn plant" , "Organ inside heart" .)