US article about unstable Crimea (8)
I believe the answer is:
american
'us' is the definition.
(I've seen this before)
'article about unstable crimea' is the wordplay.
'article' becomes 'an' (indefinite article).
'about' is an insertion indicator.
'unstable' indicates anagramming the letters.
'crimea' with letters rearranged gives 'merica'.
'an' enclosing 'merica' is 'AMERICAN'.
(Other definitions for american that I've seen before include "Eric, a man (anag.)" , "[YANKEES] member?" , "Citizen seen in Cinerama" , "Nationality of Edgar Allan Poe" , "Member of New World community" .)