The Crossword Centre Clue-Writing Competition

CCCWC January competition voters’ comments
 
Clue no. 2: Artist returns with the following information for a heraldic colour.

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A clue to ARGENT.
2 comments refer to this clue (from 2 competitors, 0 others)

Here is the text

Comments on the clue
1."A heraldic colour" is a bit of a lame definition for me.
2.Ingenious wordplay but in the surface what is 'the following information' ?