Mean to change handle (4)
I believe the answer is:
name
'handle' is the definition.
(handle can mean a name or nickname)
'mean to change' is the wordplay.
'to change' indicates anagramming the letters.
'mean' anagrammed gives 'NAME'.
(Other definitions for name that I've seen before include "By which a person is known" , "Handel, for example" , "Handle" , "Specify; famous person" , "Famous person; identify" .)