Sans melanin (6)
I believe the answer is:
albino
'sans melanin' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for albino that I've seen before include "pale thing" , "Animal with pigment deficiency" , "Abnormally white person or animal" , "Unpigmented animal" , "Unpigmented creature" .)