Fuss after Kipling hero backs emperor (6)
I believe the answer is:
mikado
'emperor' is the definition.
(mikado is a kind of emperor)
'fuss after kipling hero backs' is the wordplay.
'fuss' becomes 'ado' (synonyms).
'after' says to put letters next to each other.
'kipling hero' becomes 'kim' (I've seen this in another clue).
'backs' shows that the letters should be reversed in order.
'kim' in reverse letter order is 'mik'.
'ado' put after 'mik' is 'MIKADO'.
(Other definitions for mikado that I've seen before include "Japanese 2" , "G&S emperor" , "G & S' alternative for "The Town of Titipu"" , "Japanese ruler" , "Japanese emperor, operetta and delicious biscuit" .)