Crossword Genius

Flag for prohibitionist? (6)

Ross

I believe the answer is:

banner

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'flag' is the first definition.
(banner is a kind of flag)

'prohibitionist?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'for' is the link.

Can you help me to learn more?

(Other definitions for banner that I've seen before include "Long flag" , "It may be seen on demo" , "Streamer, flag" , "Flag used as standard" , "Pennant" .)

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