Delighted us by our part being recast (9)
I believe the answer is:
rapturous
'delighted' is the definition.
(I've seen this before)
'us by our part being recast' is the wordplay.
'by' is a charade indicator (letters next to each other).
'being recast' indicates anagramming the letters.
'our'+'part'='ourpart'
'ourpart' is an anagram of 'rapturo'.
'us' after 'rapturo' is 'RAPTUROUS'.
(Other definitions for rapturous that I've seen before include "Blissful" , "Wildly" , "over the moon" , "Delighted" , "Ecstatic" .)