A bolder chap arranged singleton’s home (8,3)
I believe the answer is:
bachelor pad
'singleton's home' is the definition.
'a bolder chap arranged' is the wordplay.
'arranged' is an anagram indicator.
'a'+'bolder'+'chap'='abolderchap'
'abolderchap' is an anagram of 'BACHELOR PAD'.
(Other definitions for bachelor pad that I've seen before include "Single male's home" , "Flat for a single man" , "Single person's flat" .)