Sweet second half of Macy (5)
I believe the answer is:
candy
'macy' is the definition.
I can't tell whether this defines the answer.
'sweet second half' is the wordplay.
'sweet' becomes 'sugar candy' (sugar candy is a kind of sweet).
'second half' suggests halving the letters.
'sugarcandy' cut in half is 'CANDY'.
'of' is the link.
Can you help me to learn more?
(Other definitions for candy that I've seen before include "American sweets" , "Girl's name (diminutive)" , "American confectionary" , "Crystallised sugar; US sweets" , "Sugary sweet" .)