Make a certain chess move (6)
I believe the answer is:
castle
'make a certain chess move' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for castle that I've seen before include "Large building; rook" , "Move king to safety - stronghold" , "Imposing residence, perhaps fortified" , "Let sac be a chess piece" , "Fortified place on the chess board" .)