Airline from eastern Russia avoided by Poles (6)
I believe the answer is:
iberia
'airline' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for iberia that I've seen before include "Spain and Portugal together" , "West European peninsula" , "Overpower, overwhelm" , "Peninsula encompasing Spain and Protugal" , "Spain and Portugal (6)" .)