Take a turn round a kingdom (5)
I believe the answer is:
spain
'kingdom' is the definition.
(Spain has a monarchy)
'take a turn round a' is the wordplay.
'take a turn' becomes 'spin' (I've seen this before).
'round' is an insertion indicator.
'spin' enclosing 'a' is 'SPAIN'.
(Other definitions for spain that I've seen before include "Crazy pains?" , "ditto" , "European country" , "part of Europe" , "European nation" .)