Odor detectors (5)
I believe the answer is:
noses
'odor detectors' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for noses that I've seen before include "Examines or detects by smelling" , "Olfactory organs" , "Proboscises" , "Beaks, conks" , "Facial features" .)