Unaltered (4)
'unaltered' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for same that I've seen before include "Identical or similar" , "Identical, not different" , "If - be the food of love, play on (Twelfth Night)" , "Ditto" , "Identical, unchanged" .)
(Other definitions for pure that I've seen before include "Unmixed with anything else" , "Chaste" , "Flawless, unsullied" , "Untainted" , "Not mixed or adulterated" .)
(Other definitions for natural that I've seen before include "Not artificial or affected" , "Frank < , twenty-one" , "Not made; off-white" , "Expected - appropriate - artless" , "Normal - genuine" .)