Guy appearing in Weber opera (4)
I believe the answer is:
rope
'guy' is the definition.
(thesaurus)
'in weber opera' is the wordplay.
'in' says the answer is hidden in the clue.
'ROPE' can be found hidden inside 'weber opera'.
'appearing' is the link.
(Other definitions for rope that I've seen before include "Strong line" , "Maybe tied up in bonds" , "Hitch" , "Enough to hang one?" , "Cable, cord, hawser" .)