International player goes after a French Open (5)
I believe the answer is:
uncap
'open' is the definition.
(I've seen this before)
'international player goes after a french' is the wordplay.
'international player' becomes 'cap' (a player who has earned international caps**).
'goes after' says to put letters next to each other.
'a french' becomes 'un' ('a' in French).
'cap' put after 'un' is 'UNCAP'.
(Other definitions for uncap that I've seen before include "Remove the lid" , "Remove a top" , "Take the top of the bottle" , "open" , "Remove a cover from" .)