Crossword Genius

Prohibitive headline? (6)

Ross

I believe the answer is:

banner

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This clue could be a double definition.

'prohibitive' is the first definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I don't see?

'headline?' is the second definition.
(I've seen this in another clue)

Can you help me to learn more?

(Other definitions for banner that I've seen before include "Flag with a slogan" , "Distinctive flag" , "The flag for one who prohibits" , "Streamer for advertising" , "Knight's standard" .)

I've seen this clue in the Evening Standard.
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