Dalmatian marking (4)
I believe the answer is:
spot
'dalmatian marking' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for spot that I've seen before include "Dirty blemish" , "See - blemish" , "Notice; sign of acne" , "Small round mark" , "Notice - fictional puppy" .)