Blemish Spooner's artificial gardens (8)
I believe the answer is:
pockmark
'blemish' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for pockmark that I've seen before include "injury" , "Scar left by skin swelling" , "Pit or hollow (originally in the skin)" .)