Appearance may fascinate (8)
I believe the answer is:
entrance
This clue is a double definition.
'appearance' is the first definition.
(thesaurus)
'fascinate' is the second definition.
('entrance' can be a synonym of 'fascinate')
'may' acts as a link.
(Other definitions for entrance that I've seen before include "An actor's coming on stage" , "arrival" , "Hold" , "drawbridge?" , "lobby?" .)