He's spouting bilge, right? (7)
I believe the answer is:
gilbert
'he's' is the definition.
'spouting bilge right?' is the wordplay.
'spouting' indicates anagramming the letters.
'right?' becomes 'rt'.
'bilge' with letters rearranged gives 'gilbe'.
'gilbe'+'rt'='GILBERT'
(Other definitions for gilbert that I've seen before include "W. S. -, The Bab Ballads author" , "Giles/George --- 23, architects" , "formerly associated with Ellice" , "Sullivan's operetta partner" , "Sullivan's librettist" .)