Crossword Genius

SI unit for amount of substance (4)

Ross

I believe the answer is:

mole

(Other definitions for mole that I've seen before include "Spy; burrower" , "Spy, skin spot and furry animal" , "Heap of soil (a 6 mountain?)" , "Pier" , "Amount of substance" .)

I've seen this clue in The Mirror.
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