Influential France international missed in cup-tie ... (7)
I believe the answer is:
seminal
'influential' is the definition.
(thesaurus)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for seminal that I've seen before include "Strongly influencing future developments" , "Of beginnings or early developments" , "Rudimentary, influential" , "Major" , "Groundbreaking" .)