The most common and most likely answer to this crossword clue is the 11 letter word CONVOLVULUS
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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CONVOLVULUS mean?
CONVOLVULUS noun- Any of several plants, of the genus Convolvulus, found in temperate climates, having small trumpet-shaped flowers.
- A species of hawkmoth, Agrius convolvuli.