Cryptic crossword clue
Weed failing to open cask with strong nuts 9

The most common and most likely answer to this crossword clue is the 9 letter word KNOTGRASS

I've seen this crossword clue in The Daily Telegraph
K
N
O
T
G
R
A
S
S

Buddy explains!

The straight part
We know that "Weed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case weed = knotgrass.
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 KNOTGRASS mean?

KNOTGRASS noun
  1. An annual plant, Polygonum aviculare, found in fields and wasteland.
  2. Paspalum distichum, a weedy perennial grass of wet areas.

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