Devalued (7)
I believe the answer is:
debased
'devalued' is the definition.
(I know that devalued can be written as debased)
This is the entire clue.
(Other definitions for debased that I've seen before include "made of lesser value" , "corrupted" , "Adulterated" , "Lowered in value" , "Lowered the quality of" .)