Internal organs (7)
(Other definitions for viscera that I've seen before include "Guts" , "organs inside" , "Internal organs, intestines" , "Abdominal organs -- cars vie (anag)" , "Entrails -- CIS rave (anag)" .)
'internal organs' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for innards that I've seen before include "Informally, the stomach and entrails" , "Insides" , "Informally, stomach and bowels" , "Guts of mechanism" , "Works" .)