Capital for Helen's abductor (5)
I believe the answer is:
paris
I believe this is a double definition.
'capital' is the first definition.
(Paris is the capital of France)
'helen's abductor' is the second definition.
(I've seen this before)
'for' is the link.
(Other definitions for paris that I've seen before include "Legendary prince" , "City; Juliet's betrothed Count" , "Capital of France" , "Abductor of Helen" , "An American in - -" .)