Half-hearted meal? It’s wonderful! (5)
I believe the answer is:
super
'it's wonderful' is the definition.
(I've seen this in another clue)
'half-hearted meal?' is the wordplay.
'half' becomes 'supe' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hearted' indicates the central letters.
'meal?' becomes 'curry'.
The central letter of 'curry' is 'r'.
'supe'+'r'='SUPER'
Can you help me to learn more?
(Other definitions for super that I've seen before include "senior cop" , "Delightful" , "Excellent - small-part actor" , "Wicked" , "Outstanding" .)