Rearranged word (7)
I believe the answer is:
anagram
'rearranged word' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for anagram that I've seen before include "Word formed by rearranging another word" , "Word arranging the letters of another" , "Letter puzzle" , "Hedonism for Sondheim" , "5 down is one" .)