Tedious year following sport (5)
I believe the answer is:
weary
'tedious' is the definition.
(I've seen this in another clue)
'year following sport' is the wordplay.
'year' becomes 'y'.
'following' says to put letters next to each other.
'sport' becomes 'wear' (sport can mean to wear or display on one's person).
'y' after 'wear' is 'WEARY'.
(Other definitions for weary that I've seen before include "Worn-out" , "flag" , "Flagging" , "Enervated" , "Tired - bored" .)