Bird with a new superman (5)
I believe the answer is:
titan
'superman' is the definition.
(thesaurus)
'bird with a new' is the wordplay.
'bird' becomes 'tit' (I've seen this before**).
'with' means one lot of letters go next to another.
'a new' becomes 'an' (I've seen this in other clues).
'tit'+'an'='TITAN'
(Other definitions for titan that I've seen before include "colossal one" , "A son of Uranus and Gaea" , "One of the first pantheon of Greek deities" , "bigwig" , "Taint in a great man" .)