Iran etc. in turmoil for sure (7)
I believe the answer is:
certain
'sure' is the definition.
('certain' can be similar in meaning to 'sure')
'iran etc in turmoil' is the wordplay.
'in turmoil' is an anagram indicator (I've seen this in other clues).
'iran'+'etc'='iranetc'
'iranetc' with letters rearranged gives 'CERTAIN'.
'for' acts as a link.
(Other definitions for certain that I've seen before include "Absolutely sure" , "Known beyond doubt" , "Sure; specific" , "Particular" , "Nice art (anag)" .)