Odor detector (4)
I believe the answer is:
nose
'odor detector' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nose that I've seen before include "Front of an aircraft" , "Grass" , "Asian wind instrument -- use Teflon (anag)" , "It detects by smell" , "Bouquet of wine; beak" .)