Heard Spooner guided physician in an impasse (8)
I believe the answer is:
deadlock
'impasse' is the definition.
(synonyms)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for deadlock that I've seen before include "Impasse, standoff" , "Stalemate - impasse" , "Situation from which no progress can be made" , "tie" , "Something opened by a key - stalemate" .)