Potato spot (3)
I believe the answer is:
eye
'potato spot' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eye that I've seen before include "'Cast a cold ... on life, on death' (Yeats)" , "It accommodates a pupil" , "study" , "Place for pupil" , "Location of 11dn" .)