Crossword Genius

Are such images good and black? (6)

Ross

I believe the answer is:

graven

I'm a little stuck... Click here to teach me more about this clue!

'are such images' is the definition.
Although both the answer and definition are past participle verbs, I can't understand how they can define each other.

'good and black?' is the wordplay.
'good' becomes 'g' (abbreviation).
'and' says to put letters next to each other.
'black?' becomes 'raven' (I've seen this before).
'g'+'raven'='GRAVEN'

Can you help me to learn more?

(Other definitions for graven that I've seen before include "Carved (as an image)" , "Fixed indelibly (in mind)" , "Carved, as images may be" .)

I've seen this clue in the Evening Standard.
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