A real artist, again, is hard to find (4)
I believe the answer is:
rare
'hard to find' is the definition.
(I've seen this in another clue)
'a real artist again' is the wordplay.
'a real artist' becomes 'ra' (this could be a standard abbreviation which I don't know about).
'again' becomes 're' (prefix meaning 'again').
'ra'+'re'='RARE'
'is' is the link.
Can you help me to learn more?
(Other definitions for rare that I've seen before include "Very scarce, hardly cooked" , "like gold dust" , "Infrequent like underdone meat" , "thin on the ground" , "Not easily come by like undercooked meat" .)