(23d) Colditz inmates come up with plan for exchange of prisoners. (4) S?O?.
(38a) After a couple of rounds have gone of course, there'll only be one pair left from this(3)?W?.
(44a) Get word of coupling from Ms Rice - Davies, singer Ms Shaw, actress Ms Bergen and Indira? (3) ?N?.
(52a) Backdoor leads to a certain area that is holy in Scotland's political life. (4) ?O?D.