Decorate with a raised design (6)
I believe the answer is:
emboss
'decorate with a raised design' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for emboss that I've seen before include "printing style" , "Produce raised design" , "Chase" , "Ornament with slightly raised pattern" , "Make a surface design in low relief" .)