Palest variety of crayon (6)
I believe the answer is:
pastel
'crayon' is the definition.
(I've seen this before)
'palest variety' is the wordplay.
'variety' indicates an anagram.
'palest' anagrammed gives 'PASTEL'.
'of' is the link.
(Other definitions for pastel that I've seen before include "Crayon - of soft shades" , "Staple light colour" , "Soft shade (of a colour)" , "Delicate and pale in colour" , "art work" .)