Embellished his danger terribly (9)
I believe the answer is:
garnished
'embellished' is the definition.
(garnishing is a kind of embellishing)
'his danger terribly' is the wordplay.
'terribly' indicates an anagram.
'his'+'danger'='hisdanger'
'hisdanger' is an anagram of 'GARNISHED'.
(Other definitions for garnished that I've seen before include "Decorated" , "Added parsley, perhaps" .)