Cryptic crossword clue
Bloody fluid used as supplement, forgetting every day remains 9

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

R
E
L
I
Q
U
I
A
E

Buddy explains!

The straight part
We know that "remains" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case remains = reliquiae.
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 RELIQUIAE mean?

RELIQUIAE noun
  1. Remains, especially of fossil organisms.
  2. Artifacts; things made or modified by human art.

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