Joyful quote picked up about cast in play (8)
I believe the answer is:
ecstatic
'joyful' is the definition.
(I've seen this before)
'quote picked up about cast in play' is the wordplay.
'quote' becomes 'cite' ('cite' can be a synonym of 'quote'**).
'picked up' shows that the letters should be reversed in order.
'about' means one lot of letters goes inside another.
'in play' is an anagram indicator.
'cite' reversed gives 'etic'.
'cast' is an anagram of 'csta'.
'etic' enclosing 'csta' is 'ECSTATIC'.
(Other definitions for ecstatic that I've seen before include "Joyful" , "elated" , "Cock-a-hoop" , "Really overjoyed, gleeful" , "Cite acts, being overjoyed" .)