Like some senators, protest 50% of Arctic being taken over (10)
I believe the answer is:
democratic
'like some senators protest 50%' is the definition.
I can't tell whether this defines the answer.
'of arctic being taken over' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'being taken' indicates putting letters inside.
'over' becomes 'demo' (I can't justify this - if you can you should give a lot more credence to this answer).
'arctic' is an anagram of 'cratic'.
'cratic' enclosing 'demo' is 'DEMOCRATIC'.
Can you help me to learn more?
(Other definitions for democratic that I've seen before include "Enabling the will of the people" , "Popular" , "23 [JFK] was" , "party in US" , "Egalitarian" .)