Dental deposit (6)
'dental deposit' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tartar that I've seen before include "She terrifies" , "Fearsome person: kind of sauce" , "Cold sauce, popular with fish" , "Deposit that forms on teeth" , "Hard, crusty deposit on the teeth" .)
'dental deposit' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for plaque that I've seen before include "Memorial slab" , "Brass memorial tablet" , "Dental deposit" , "Commemorative tablet - unwanted film on teeth" , "Sticky deposit on teeth" .)