Traveller mentioned Charlie winning golf competition (5,3)
I believe the answer is:
ryder cup
'golf competition' is the definition.
(I know that Ryder Cup is a type of golf competition)
'traveller mentioned charlie winning' is the wordplay.
'traveller' becomes 'rider' (rider is a kind of traveller).
'mentioned' shows a homophone (sound like).
'charlie winning' becomes 'cup' (I am not sure about this - if you are sure you should believe this answer much more).
'rider' is a homophone of 'ryder'.
'ryder'+'cup'='RYDER CUP'
Can you help me to learn more?
(Other definitions for ryder cup that I've seen before include "Biennial international golf tournament" , "sporting contest" , "trophy" , "US-Europe golf event" , "Golfing contest" .)