Strike is a success (3)
I believe the answer is:
hit
This clue is a double definition.
'strike' is the first definition.
(synonyms)
'a success' is the second definition.
(a hit is a commercial success)
'is' is the link.
(Other definitions for hit that I've seen before include "Knock" , "Theatrical success,quite striking" , "Successful record/film" , "that pleases the public" , "Popular record" .)