Maybe like port (4)
I believe the answer is:
kiel
'port' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I can't see?
'maybe like' is the wordplay.
'maybe' indicates anagramming the letters.
'like' is an anagram of 'KIEL'.
Can you help me to learn more?
(Other definitions for kiel that I've seen before include "Baltic port" , "canal" .)