Hunted animals: one may be on board (4)
I believe the answer is:
game
I believe this is a double definition.
'hunted animals' is the first definition.
(I've seen this before)
'one may be on board' is the second definition.
(as in a board game)
(Other definitions for game that I've seen before include "Hobbling" , "Pastime - quarry" , "have a flutter" , "Sport - willing - lame" , "Sport - amusement" .)