Ranked, in a tournament (6)
I believe the answer is:
seeded
'ranked in a tournament' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for seeded that I've seen before include "In tennis tournament, graded in first sixteen" , "Graded in first 16 players of tennis tournament" , "In tennis tournament, listed in top 16" , "Sown" , "Among the favourites" .)