The most common and most likely answer to this crossword clue is the 7 letter word SPIRAEA
I've seen this crossword clue in The Guardian
S
P
I
R
A
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A
Buddy explains!

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 SPIRAEA mean?
SPIRAEA noun- Any of many flowering shrubs, of the genus Spiraea, that have clusters of white or pink flowers
- The Astilbe.