The most common and most likely answer to this crossword clue is the 7 letter word MILFOIL
I've seen this crossword clue in The Daily Telegraph
M
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More clues leading to the result MILFOIL
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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 MILFOIL mean?
MILFOIL noun- Common yarrow, Achillea millefolium.
- Any of several similar pungent Eurasian herbs, of the genus Achillea
- Any plants of the genus Myriophyllum; water milfoil.