Managed to be somewhat unnatural (9)
I believe the answer is:
contrived
This could be a double definition.
'managed' is the first definition.
(contrive can mean to manage to do something)
'somewhat unnatural' is the second definition.
'contrived' can be an answer for 'unnatural' (similar in meaning). I'm unsure of the 'somewhat' bit.
'to be' is the link.
Can you help me to learn more?
(Other definitions for contrived that I've seen before include "orchestrated" , "Artificial" .)