Sport in Gabon, sword dancing (12)
I believe the answer is:
snowboarding
'sport' is the definition.
(snowboarding is a winter sport)
'in gabon sword dancing' is the wordplay.
'dancing' indicates an anagram.
'in'+'gabon'+'sword'='ingabonsword'
'ingabonsword' is an anagram of 'SNOWBOARDING'.
(Other definitions for snowboarding that I've seen before include "winter sports holiday?" , "winter sport?" .)