Prohibitive placard? (6)
I believe the answer is:
banner
This might be a double definition.
'prohibitive' is the first definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?
'placard?' is the second definition.
(a placard is a banner or poster)
Can you help me to learn more?
(Other definitions for banner that I've seen before include "Long flag" , "Knight's standard" , "Standard carried at demo etc" , "Flag used as standard" , "Flag bearing a device" .)