The most common and most likely answer to this crossword clue is the 9 letter word DAFFODILS
I've seen this crossword clue in Financial Times
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More clues leading to the result DAFFODILS
Buddy explains!

The straight part
We know that "Wordsworth’s bloomers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wordsworth’s bloomers = daffodils.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 DAFFODILS mean?
DAFFODILS noun- A bulbous plant of the genus Narcissus, with yellow flowers and a trumpet shaped corona, especially Narcissus pseudonarcissus, the national flower of Wales.
- A brilliant yellow color, like that of a daffodil.