Not even fully finished, strangely enough (5)
I believe the answer is:
oddly
'strangely enough' is the definition.
(synonyms)
'not even fully finished' is the wordplay.
'not even' becomes 'odd' ('odd' is the opposite to 'even').
'fully finished' becomes 'ly' (I can't justify this - if you can you should believe this answer much more).
'odd'+'ly'='ODDLY'
Can you help me to learn more?
(Other definitions for oddly that I've seen before include "In a peculiar way" , "In a strange way" , "This clue [32A] is not numbered so" , "not in the usual way" , "Strangely, curiously" .)