Nix Olympica’s western extremity (7)
I believe the answer is:
nothing
'nix' is the definition.
('nothing' can be a synonym of 'nix')
I don't understand the rest of the clue.
(Other definitions for nothing that I've seen before include "See 1" , "See 13" , "Zero, nil" , "Not anything" , "signifying love" .)