Communist seems to reject outsiders, free from blame (6)

I believe the answer is:
redeem
'free from blame' is the definition.
'redeem' can be an answer for 'free' (I've seen this before). I'm not sure about the 'from blame' bit.
'communist seems to reject outsiders' is the wordplay.
I cannot quite understand how this works, but
'communist' could be 'red' (red can informally mean communist) and 'red' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for redeem that I've seen before include "Save or cash in" , "Buy back from the pawn shop" , "Buy back; absolve" , "Repay (a bond); save" , "Save from damnation or pay back loan" .)
