Prohibition pennants? (7)
I believe the answer is:
banners
'pennants?' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps you can see an association between them that I don't see?
'prohibition' is the wordplay.
I cannot really understand how this works, but
'prohibition' could be 'ban' (synonyms) and 'ban' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for banners that I've seen before include "Newspaper headlines or flags" , "Long strips with messages hung in public places" .)