Game of skill? Not entirely (5)
I believe the answer is:
darts
'game' is the definition.
(darts is a kind of game)
'skill? not entirely' is the wordplay.
I cannot quite see how this works, but
'skill?' could be 'art' (both can mean a talent) and 'art' is present in the answer.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for darts that I've seen before include "Tears" , "Game with arrows and a board" , "Shoots" , "Game with board and missiles" , "quick movements" .)