Cheat grabbing man's wax stick (6)
I believe the answer is:
crayon
'wax stick' is the definition.
'crayon' can be an answer for 'wax' (I've seen this before). I'm unsure of the 'stick' bit.
'cheat grabbing man's' is the wordplay.
'cheat' becomes 'con' (conning is a kind of cheating).
'grabbing' is an insertion indicator.
'man' becomes 'ray' (Man Ray was a 20th-century artist).
'con' enclosing 'ray' is 'CRAYON'.
Can you help me to learn more?
(Other definitions for crayon that I've seen before include "(Draw with) a coloured stick" , "alternative to charcoal" , "Pencil of chalk or wax" , "Producer of sketch" , "Stick to colour" .)