Beloved certain to walk round (9)
I believe the answer is:
treasured
'beloved' is the definition.
(thesaurus)
'certain to walk round' is the wordplay.
'certain' becomes 'sure' (synonyms).
'to walk' becomes 'tread' (treading is a kind of walking).
'round' means one lot of letters goes inside another.
'sure' put into 'tread' is 'TREASURED'.
(Other definitions for treasured that I've seen before include "Prized, precious" , "thought highly of" , "Much-valued" , "Darling" , "Cherished, precious" .)