Clueless Tramp will notify editor (3-8)
I believe the answer is:
ill-informed
'clueless' is the definition.
Both the answer and definition are adjectives.
Perhaps you can see an association between them that I don't see?
'tramp will notify editor' is the wordplay.
'tramp will' becomes 'ill' (I am not sure about this - if you are sure you should believe this answer much more).
'notify' becomes 'inform' (I've seen this before).
'editor' becomes 'ed'.
'ill'+'inform'+'ed'='ILL-INFORMED'
(Another definition for ill-informed that I've seen is " ignorant".)