Colour initially dazzles your eyes (3)
I believe the answer is:
dye
'colour' is the definition.
(dyeing is a kind of colouring)
'initially dazzles your eyes' is the wordplay.
'initially' suggests taking the first letters.
The first letters of 'dazzles your eyes' is 'DYE'.
(Other definitions for dye that I've seen before include "Colouring liquid" , "Colourant" , "Colouring matter" , "Soluble substance for staining or colouring" , "Colour (fabrics)" .)