Game created by guerrilla leader’s son (5)
I believe the answer is:
chess
'game' is the definition.
(chess is a kind of game)
'by guerrilla leader's son' is the wordplay.
'by' is a charade indicator (letters next to each other).
'guerrilla leader's' becomes 'che's' (guerrilla revolutionary Che Guevara).
'son' becomes 's' (genealogical abbreviation for son).
'ches'+'s' is 'CHESS'.
'created' is the link.
(Other definitions for chess that I've seen before include "Game involving mates" , "that has over thirty men on board" , "Game with kings and queens" , "show" , "Pieces moved in this" .)