Quiet place (6)
(Other definitions for repose that I've seen before include "State of tranquillity" , "Rest - tranquillity" , "Lie at rest" , "take it easy" , "peace" .)
'quiet place' is the definition.
This is all the clue.
(Other definitions for retreat that I've seen before include "Withdraw from battle" , "snug" , "The Priory, say" , "Back away" , "Give ground" .)