Move at chess? Players initially look edgy (6)
I believe the answer is:
castle
'move at chess?' is the definition.
(castling is a move in chess)
'players initially look edgy' is the wordplay.
'players' becomes 'cast' (I've seen this before).
'initially' indicates taking the first letters.
The first letters of 'look edgy' is 'le'.
'cast'+'le'='CASTLE'
(Other definitions for castle that I've seen before include "fortification" , "Let sac be a chess piece" , "Dover, perhaps" , "Large fortified building" , "Fortified mansion" .)