Produce artwork that's required by supermarket chain (4)
I believe the answer is:
'produce' is the definition.
(I know that etch is a type of print)
'artwork that's required by supermarket chain' is the wordplay.
'ETCH' is hidden in amongst the letters.
However, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for etch that I've seen before include "Corrode" , "Incribe" , "Cut into a block used for printing" , "Engrave deeply" , "Use acid to design on metal or glass" .)