Happy to arrange the right deal (5-7)
I believe the answer is:
light-hearted
'happy' is the definition.
(thesaurus)
'arrange the right deal' is the wordplay.
'arrange' is an anagram indicator.
'the'+'right'+'deal'='therightdeal'
'therightdeal' is an anagram of 'LIGHT-HEARTED'.
'to' acts as a link.
(Other definitions for light-hearted that I've seen before include "Cheerful, carefree" , "Free from anxiety" , "Cheerful, unserious" , "Airy and carefree" , "Not serious" .)