Crayon left beside stick (6)
I believe the answer is:
pastel
'crayon' is the definition.
(thesaurus)
'left beside stick' is the wordplay.
'left' becomes 'l' (common abbreviation).
'beside' is a charade indicator (letters next to each other) (I've seen this in other clues).
'stick' becomes 'paste' (I've seen this before).
'l' put after 'paste' is 'PASTEL'.
(Other definitions for pastel that I've seen before include "Soft shade (of a colour)" , "Chalk-like crayon" , "A light delicate shade of colour" , "Crayon used in art" , "Of a colour, subtle" .)