Stalemate as setter's out of date (7)
I believe the answer is:
impasse
'stalemate' is the definition.
(I know that stalemate can be written as impasse)
'setter's out of date' is the wordplay.
'setter's' becomes 'I'm' (referring to the crossword setter).
'out of date' becomes 'passe' (I've seen this before).
'im'+'passe'='IMPASSE'
'as' is the link.
(Other definitions for impasse that I've seen before include "Stand-off, stalemate" , "I permit no further progress" , "Situation of deadlock" , "cul-de-sac" , "Situation in which progress is impossible" .)