Skin blemish and burrowing animal (4)
I believe the answer is:
mole
'skin blemish and burrowing animal' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for mole that I've seen before include "Skin blemish and burrowing animal" , "Underground worker!" , "Amount of substance" , "Heap of soil (a 6 mountain?)" , "Spot - burrowing mammal" .)