Word puzzle (7)
(Other definitions for anagram that I've seen before include "New arrangement" , "Gelding can be niggled by this" , "Hedonism for Sondheim" , ""Angered" of "enraged", perhaps?" , "Mix-up" .)
'word puzzle' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rebus that I've seen before include "Pictorial teaser" , "Puzzle where pictures represent syllables and words" , "Pictorial word puzzle" , "Picture and word puzzle" , "Puzzling device" .)