Eisenhower, familiarly (3)
I believe the answer is:
ike
'eisenhower familiarly' 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 "Thirty fourth US president's nickname" , "Former US President (informally)" , "Dwight D. Eisenhower, in short" , "President Eisenhower" , "Nickname for Dwight Eisenhower" .)