Cryptic crossword clue
Beacon designed to cover western plant 7

The most common and most likely answer to this crossword clue is the 7 letter word COWBANE

I've seen this crossword clue in The Daily Telegraph
C
O
W
B
A
N
E


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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 COWBANE mean?

COWBANE noun
  1. Any of several related poisonous plants of the genus Cicuta
  2. Cicuta virosa, the name species of this genus.

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