Moved on board, spearheaded by players (7)
I believe the answer is:
castled
'moved on board' is the definition.
(castling is a move in chess)
'spearheaded by players' is the wordplay.
'spearheaded' becomes 'led'.
'by' means one lot of letters go next to another.
'players' becomes 'cast' (I've seen this before).
'led' put after 'cast' is 'CASTLED'.
(Other definitions for castled that I've seen before include "moved to protect king" , "Made a chess move" , "defensive move" , "Moved king into safety" , "made move in game" .)