Cryptic crossword clue
Allow cut grass to cover lines, with terrible consequences 8

The most common and most likely answer to this crossword clue is the 8 letter word LETHALLY

I've seen this crossword clue in Financial Times
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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.
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What does LETHALLY mean?

LETHALLY adverb
  1. In a lethal manner, in manner which is or will be fatal.

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