New riches he'd treasured (9)
I believe the answer is:
cherished
'treasured' is the definition.
(synonyms)
'new riches he'd' is the wordplay.
'new' indicates an anagram.
'riches' anagrammed gives 'cheris'.
'cheris'+'hed'='CHERISHED'
(Other definitions for cherished that I've seen before include "clung to" , "Greatly valued" , "Lovingly cared for" , "Precious" , "Held dear" .)