Cryptic crossword clue
Fatal mistake by the lady 7

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

I've seen this crossword clue in Financial Times
D
E
A
T
H
L
Y

Buddy explains!

The straight part
We know that "Fatal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fatal = deathly.
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 DEATHLY mean?

DEATHLY adjective
  1. Appearing as though dead, or on the verge of death.
  2. Deadly, fatal, causing death.
  3. Extreme.
DEATHLY adverb
  1. In a way that resembles death.
  2. Extremely, dreadfully.

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