Crossword Genius

Mineral from old Roman watering-hole (8)

Ross

I believe the answer is:

cinnabar

'mineral' is the definition.
(I've seen this before)

'old roman watering-hole' is the wordplay.
'old roman' becomes 'cinna' (Roman politician).
'watering hole' becomes 'bar' (I've seen this before).
'cinna'+'bar'='CINNABAR'

'from' is the link.

(Other definitions for cinnabar that I've seen before include "Heavy red mineral containing mercury" , "Bright red mineral containing mercury" , "Red mercury sulphide" , "Brian can make vermilion pigment" .)

I've seen this clue in The Telegraph.
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