Cryptic crossword clue
Heartless darkness I tempt to return, finding blood filters 9

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

I've seen this crossword clue in The Guardian
G
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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 GLOMERULI mean?

GLOMERULI noun
  1. A small intertwined group of capillaries within nephrons of the kidney that filter the blood to make urine
  2. A structure in the olfactory bulb central to olfactory sensory transduction, composed of receptor neuron axons and mitral neuron dendrites and organized by odor type.
  3. Any of several other similar intertwined masses of things

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