Half of a candy duo (3)
I believe the answer is:
ike
'half of a candy duo' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ike that I've seen before include "Nickname of old US president" , "US general who became president, in short" , "President Eisenhower's nickname" , "Dwight D. Eisenhower, in short" , "Former US President (informally)" .)