Inspection by an officer finishes the game on board (9)
I believe the answer is:
checkmate
'inspection by an officer finishes the game on board' is the definition.
I can't judge whether this definition defines the answer.
'inspection by an officer' is the wordplay.
'inspection' becomes 'check' (check is a kind of inspection).
'by' is a charade indicator (letters next to each other).
'an officer' becomes 'mate' (mate is a kind of officer).
'check'+'mate'='CHECKMATE'
Can you help me to learn more?
(Other definitions for checkmate that I've seen before include "Winning call on board" , "defeat on board" , "Chess game ending" , "final defeat" , "Complete victory" .)