Incomplete moniker (3)
I believe the answer is:
ike
'incomplete moniker' is the definition.
The definition suggests a singular noun which matches the answer.
'incomplete moniker' is the wordplay.
'incomplete' indicates a hidden word (an incomplete sample of the clue).
'IKE' is hidden within 'moniker'.
Can you help me to learn more?
(Other definitions for ike that I've seen before include "US general who became president, in short" , "Former US President (informally)" , "Nickname of old US president" , "Dwight D. Eisenhower, in short" , "President Eisenhower's nickname" .)