Delighted to sing in terrible need (9)
I believe the answer is:
enchanted
'delighted' is the definition.
(similar in meaning)
'sing in terrible need' is the wordplay.
'sing' becomes 'chant' (chanting is a kind of singing).
'in' is an insertion indicator.
'terrible' indicates an anagram.
'need' with letters rearranged gives 'ened'.
'chant' put inside 'ened' is 'ENCHANTED'.
'to' acts as a link.
(Other definitions for enchanted that I've seen before include "Bewitched" , "Delighted, charmed" , "Put under spell" , "delighted by spelling" , "Beguiled" .)