Deadlock, stalemate (7)
I believe this is a double definition.
'deadlock' is the first definition.
(I've seen this before)
'stalemate' is the second definition.
(I've seen this before)
(Other definitions for stand-off that I've seen before include "Deadlock (in match)" , "Deadlock between equal opponents" , "Rugby halfback" , "Impasse" , "Deadlock between equally matched opponents" .)
I believe this clue is a double definition.
'deadlock' is the first definition.
(I know that impasse is a type of deadlock)
'stalemate' is the second definition.
(I know that stalemate can be written as impasse)
(Other definitions for impasse that I've seen before include "Maybe gridlock" , "No progress is possible in this type of situation" , "Unpromising situation" , "There's no way past it" , "'Deadlock, no progress can be made (7)'" .)