In a strangely uneven manner (5)
I believe the answer is:
oddly
'in a strangely' is the definition.
I can't judge whether this definition defines the answer.
'uneven manner' is the wordplay.
'uneven' becomes 'odd' (I've seen this before).
'manner' becomes 'ly' (I can't explain this - if you can you should give a lot more credence to this answer).
'odd'+'ly'='ODDLY'
Can you help me to learn more?
(Other definitions for oddly that I've seen before include "Strangely, curiously" , "In a peculiar way" , "Weirdly" , "strange to say?" , "not in the usual way" .)