Artificial piece: damn amazing, some reflected (3-4)
I believe the answer is:
man-made
'artificial' is the definition.
('man-made' can be similar in meaning to 'artificial')
'piece damn amazing some reflected' is the wordplay.
'some' indicates a hidden word.
'reflected' shows that the letters should be reversed in order.
'edamnam' can be found hidden inside 'piece damn amazing'.
'edamnam' back-to-front is 'MAN-MADE'.
(Other definitions for man-made that I've seen before include "Caused by humans" , "Artificial, synthetic" , "Constructed by humans, not by nature" .)