Happy to embrace good person, a competitor (10)
I believe the answer is:
contestant
'competitor' is the definition.
(thesaurus)
'happy to embrace good person a' is the wordplay.
'happy' becomes 'content' ('content' is associated in meaning with 'happy'**).
'to embrace' indicates putting letters inside.
'good person' becomes 'st' (saint).
'st'+'a'='sta'
'content' placed around 'sta' is 'CONTESTANT'.
(Other definitions for contestant that I've seen before include "Person vying with others" , "One of those competing" , "Entrant" , "One in quiz" , "Candidate" .)