Article is certain to omit American responses (7)
I believe the answer is:
answers
'responses' is the definition.
('answer' can be a synonym of 'response')
'article is certain to omit american' is the wordplay.
I cannot really understand how this works, but
'article' could be 'an' (indefinite article) and 'an' is present in 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 answers that I've seen before include "Rawness (anag)" , "is satisfactory" , "keys" , "Replies" , "Responses; solutions" .)