Splendid old coin (5)
I believe the answer is:
noble
I believe this is a double definition.
'splendid' is the first definition.
(thesaurus)
'old coin' is the second definition.
(I've seen this before)
(Other definitions for noble that I've seen before include "Of blue blood" , "Having high moral character" , "Former gold coin" , "Worthy" , "Stately" .)