Cryptic crossword clue
Nocturnal creature needing regular transfusions 7,3

The most common and most likely answer to this crossword clue is the 7 plus 3 letter word VAMPIRE BAT

I've seen this crossword clue in Financial Times
V
A
M
P
I
R
E
B
A
T

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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.

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