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