The most common and most likely answer to this crossword clue is the 8 letter word KNOTWEED
I've seen this crossword clue in The Daily Telegraph
K
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T
W
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D
More clues leading to the result KNOTWEED
- Oddly, kind of fabric we struggle to pull up in bed?
- Tie small daughter, a hazard in the garden
- Possible end to Kew Garden scourge
- Last thing park wants — no running water for plant
- King died confining presumably large garden invader
- Edge of bank by river containing no troublesome plant
- Kew noted straggly unwanted plant
- One’s tied up with drip that’s not welcome in garden
- King died, pierced by apparently large invader in the garden
- Ass pulled up two-thirds of the way through eating sweet plant
Buddy explains!
The straight part
We know that "unwanted plant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unwanted plant = knotweed.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.
Crossword Answer definitions
KNOTWEED noun- Any of several plants of the genus Polygonum, with jointed stems and inconspicuous flowers