Register a cottage (5)
I believe the answer is:
lodge
I believe this clue is a double definition.
'register' is the first definition.
(thesaurus)
'a cottage' is the second definition.
(thesaurus)
(Other definitions for lodge that I've seen before include "Masonic meeting place" , "Stay (somewhere) temporarily" , "Settle" , "present" , "Cabin for seasonal activity - become embedded" .)