Stirrup's spot (3)
I believe the answer is:
ear
'stirrup's spot' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ear that I've seen before include "Part of cereal plant containing seed" , "Discernment musicians need" , "Organ of hearing" , "Auditory organ" , "Fruiting head of corn" .)