Indelible felt-tip pen (6)
I believe the answer is:
marker
(Other definitions for marker that I've seen before include "Felt-tip pen; scorer" , "Visible point to aim for" , "Writing implement" , "Test official" , "Buoy" .)
I believe the answer is:
marker
(Other definitions for marker that I've seen before include "Felt-tip pen; scorer" , "Visible point to aim for" , "Writing implement" , "Test official" , "Buoy" .)