Distracted America's unfinished war in Russian province (6)
I believe the answer is:
crimea
'war in russian province' is the definition.
'crimea' can be an answer for 'war' (I've seen this before). I am not sure about the 'in russian province' bit.
'distracted america's unfinished' is the wordplay.
'distracted' indicates anagramming the letters.
'unfinished' means to remove the last letter.
'america' with its final letter taken off is 'americ'.
'americ' with letters rearranged gives 'CRIMEA'.
Can you help me to learn more?
(Other definitions for crimea that I've seen before include "Disputed Black Sea peninsula" , "Where there was a battle" , "Ukraine peninsula, scene of war (1853-6)" , "historic war zone" , "Ukrainian peninsula, theatre of 1853-6 war" .)