Possibly one's hooter (4)
I believe the answer is:
nose
'hooter' is the definition.
(I've seen this before)
'possibly one's' is the wordplay.
'possibly' indicates anagramming the letters.
'ones' anagrammed gives 'NOSE'.
(Other definitions for nose that I've seen before include "Snout" , "Proboscis" , "Aroma of wine" , "Small margin of victory" , "scent" .)