King? Both sides led by one in curtailed boardgame (7)
I believe the answer is:
charles
'king?' is the definition.
(King Charles I, II or III)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for charles that I've seen before include "-- Darwin; -- Kingsley" , "French king" , "King beheaded in 1649" , "[LAWMAKER]?" , "- Darwin; - Dickens" .)