19 across
Colour
in
image
on
rock
for
sign
(9)
Colour in image on rock for sign (9)
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The definition is at the end of the clue.
How the clue works
The definition is sign, something that indicates or foreshadows. You take "colour" (RED) and drop it inside "image" (pic) to get PREDIC, then tack on "rock" (tor) at the end.