Some pallid yellow colour? (3)
I believe the answer is:
dye
'colour?' is the definition.
(I know that dye is a kind of colour)
'some pallid yellow' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'DYE' can be found hidden inside 'pallid yellow'.
(Other definitions for dye that I've seen before include "Soluble substance for staining or colouring" , "Pigment" , "Colour (fabrics)" , "Staining material" , "Colouring matter" .)