Crossword Genius

Not a bold colour (6)

Ross

I believe the answer is:

yellow

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

'colour' is the definition.
(I know that yellow is an colour)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for yellow that I've seen before include "Offensively sensational" , "Primary colour" , "centre of egg" , "Custardy shade" , "(Of paper) age" .)

I've seen this clue in The Irish Independent.
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