Sport, one a few find boring (9)
I believe the answer is:
wearisome
'boring' is the definition.
(I know that boring can be written as wearisome)
'sport one a few' is the wordplay.
'sport' becomes 'wear' (sport can mean to wear or display on one's person).
'one' becomes 'i' (Roman numeral).
'a few' becomes 'some' (both can mean a small amount of something).
'wear'+'i'+'some'='WEARISOME'
'find' is the link.
(Other definitions for wearisome that I've seen before include "pestilential" , "Trying" , "Boring" , "Tedious, tiring" , "Vexatious" .)