Rearrangement of letters (7)
I believe the answer is:
anagram
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rearrangement of letters</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for anagram that I've seen before include "A ragman (anag)" , "Nag a ram (anag)" , "There's confusion among characters" , "Scramble of letters (to make trestle, perhaps)" , ""Diagnose" is one of "San Diego"" .)