Cryptic crossword clue
Heart stimulant derived from split fingernail, surprisingly 9

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

I've seen this crossword clue in Financial Times
D
I
G
I
T
A
L
I
N

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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 DIGITALIN mean?

DIGITALIN noun
  1. Any of a mixture of glycosides, extracted from the foxglove plant, that are used as cardiotonics.

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