Might they add colour to a writer's work? (7)

I believe the answer is:

crayons

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'might they' is the definition.
The definition suggests a plural noun which matches the answer.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for crayons that I've seen before include "Coloured writing sticks" , "Coloured sticks for drawing" , "Wax pencils" , "colours" .)

I've seen this clue in The Globe and Mail.

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