Crossword Genius

A blonde or what made her dumb? (3)

Ross

I believe the answer is:

ash

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'a blonde' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for ash that I've seen before include "Remains from the yule-log?" , "Tree; burnt residue" , "Hard pale wood" , "It no longer burns" , "Silvery grey" .)

I've seen this clue in the Evening Standard.
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