Gore and Eisenhower are similar (5)
I believe the answer is:
alike
'are similar' is the definition.
(synonyms)
'gore and eisenhower' is the wordplay.
'gore' becomes 'al' (I am not sure about this - if you are sure you should believe this answer much more).
'and' is a charade indicator (letters next to each other).
'eisenhower' becomes 'Ike' (Ike was a nickname of President Dwight Eisenhower).
'al'+'ike'='ALIKE'
Can you help me to learn more?
(Other definitions for alike that I've seen before include "Similar, analogous" , "Equally" , "Dull pain" , "In a similar way" , "Resembling each other" .)