The most common and most likely answer to this crossword clue is the 10 letter word DANDELIONS
I've seen this crossword clue in The Guardian
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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.
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What does DANDELIONS mean?
DANDELIONS noun- Any of the several species of plant in the genus Taraxacum, characterised by yellow flower heads and notched, broad-ended leaves, especially the common dandelion (Taraxacum officinale).
- The flower head or fruiting head of the dandelion plant.
- A yellow colour, like that of the flower.