Possible Clues:

• Important aspect of wine showing up in curious bouquet
• Flowers, say, gone astray
• Posy makes horse noise, according to Spooner
• Awfully curious borders for one area for flowers
• Posy of flowers, say, gone rotten
• Arrangement of flowers — gone, say (anag)
• Sweet bunch, for example with no opportunity to speak outside
• Bunch for one inhibited by lack of authority
• Is the rest of the head straight in this bunch?
• Bunch on move say gone