The most common and most likely answer to this crossword clue is the 5 plus 7 letter word SWEET WILLIAM
I've seen this crossword clue in Financial Times
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More clues leading to the result SWEET WILLIAM
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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 SWEET WILLIAM mean?
SWEET WILLIAM noun- A flowering plant, Dianthus barbatus, in the family Caryophyllaceae, native to the mountains of southern Europe from the Pyrenees east to the Carpathians and the Balkans.