Is after standard capital (5)
I believe the answer is:
paris
'capital' is the definition.
(Paris is the capital of France)
'is after standard' is the wordplay.
'after' means one lot of letters go next to another.
'standard' becomes 'par' (standard of play in golf).
'is' put after 'par' is 'PARIS'.
(Other definitions for paris that I've seen before include "An American in - -" , "Abductor of Helen" , "captivated Helen" , "He abducted Helen of Troy" , "Continental capital" .)