Crossword Genius

Vein of coal (4)

Ross

I believe the answer is:

seam

'vein of coal' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for seam that I've seen before include "Stitched joint" , "Unfasten" , "Join in material - layer of coal" , "Join - stratum of ore" , "Stratum (of a mineral)" .)

I've seen this clue in The Telegraph.
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