Traditional board game (4)
'traditional board game' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ludo that I've seen before include "race for four tokens" , "Race game" , "Game (meaning 'I play' in Latin)" , "Traditional board game" , "Simple board game, involving dice" .)
(Other definitions for chess that I've seen before include "that has over thirty men on board" , "show" , "This is played on board" , "Sixteen-men-a-side game" , "In which two bishops will participate" .)
'traditional board game' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for draughts that I've seen before include "drinks" , "Checkers (US)" , "Board game for two" , "Half of 1D [GAME OR BIRD]" , "plans" .)