Some criticism over turn (4)
I believe the answer is:
move
'turn' is the definition.
(someone's turn or move in a board game)
'some criticism over' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'MOVE' can be found hidden inside 'criticism over'.
(Other definitions for move that I've seen before include "Change location" , "Stir - change places" , "Manoeuvre; go" , "Relocate" , "Depart" .)