A blonde or what made her dumb? (3)
I believe the answer is:
ash
'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" .)