Organ needing attention? (3)
I believe the answer is:
ear
This clue is a double definition.
'organ' is the first definition.
(the ear is an organ)
'attention' is the second definition.
(having someone's ear is having their attention)
'needing' is the link.
(Other definitions for ear that I've seen before include "Attention; seed head" , "Organ involved with balance" , "Auricle" , "Spike (wheat)" , "Seed container" .)