Clue: Undertake surprise audit to identify arrangement of men on board (4-5)
Answer: SPOT-CHECK
Explanation: Definition: Undertake surprise audit
 SPOT(to identify/to recognise) CHECK(an arrangement of pieces/men on a chessboard where a player has placed his/her opponent's king under direct attack).
Or does "check" refer to the black and white squares on which the pieces are placed?