A question of organisation (3)
I believe the answer is:
who
This clue is a double definition.
'a question' is the first definition.
(I've seen this before)
'organisation' is the second definition.
(WHO is an example)
'of' is the link.
(Other definitions for who that I've seen before include "Time-travelling Doctor" , "UN health agency" , "international medical group" , "medical experts" , "Fictional doctor" .)