Article is certain to omit American responses (7)
I believe the answer is:
answers
'responses' is the definition.
(answer is a kind of response)
'article is certain to omit american' is the wordplay.
I cannot quite understand how this works, but
'article' could be 'an' (indefinite article) and 'an' is located 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" .)