Their work as an artist is deeply impressive (8)
I believe the answer is:
engraver
'their work as an' is the definition.
I can't tell whether this defines the answer.
'artist is deeply impressive' is the wordplay.
I cannot quite see how this works, but
'artist' could be 'ra' (Royal Academician, member of Royal Academy of Arts) and 'ra' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for engraver that I've seen before include "Craftsman carving a design" , "One who carves inscriptions into jewellery" , "one who writes cuttingly" , "Design cutter" , "One cutting a design" .)