Turn regimen about and pause (11)
I believe the answer is:
interregnum
'pause' is the definition.
(thesaurus)
'turn regimen about' is the wordplay.
'about' indicates an anagram.
'turn'+'regimen'='turnregimen'
'turnregimen' anagrammed gives 'INTERREGNUM'.
'and' acts as a link.
(Other definitions for interregnum that I've seen before include "Gap at the top" , "Period between successive reigns" , "Period between periods of normal rule" , "Period between rules" , "Leaderless period" .)