Stalemate, impasse (8)

I believe the answer is:

deadlock

This clue is a double definition.

'stalemate' is the first definition.
(synonyms)

'impasse' is the second definition.
(synonyms)

(Other definitions for deadlock that I've seen before include "Stalemate - impasse" , "Standstill" , "tie" , "Situation from which no progress can be made" , "Stalemate - it requires a key to open" .)

I've seen this clue in the Irish Times (Simplex), The Irish Times and The Times.

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