Walk about certain to be highly esteemed (9)
I believe the answer is:
treasured
'highly esteemed' is the definition.
'treasured' can be an answer for 'esteemed' (thesaurus). I'm not certain of the 'highly' bit.
'walk about certain' is the wordplay.
'walk' becomes 'tread' (treading is a kind of walking).
'about' indicates putting letters inside.
'certain' becomes 'sure' (synonyms).
'tread' placed around 'sure' is 'TREASURED'.
'to be' acts as a link.
Can you help me to learn more?
(Other definitions for treasured that I've seen before include "Cherished, precious" , "Valuable" , "thought highly of" , "Much-valued" , "Valued" .)