The most common and most likely answer to this crossword clue is the 5 letter word RENAL
I've seen this crossword clue in Financial Times
R
E
N
A
L
More clues leading to the result RENAL
- Some children always concerned with part of body
- No end of interest in payment for use of an organ
- Solid storing nitrogen from an organ
- Material includes composition ultimately related to organ
- Somehow learn of the kidneys
- Official carries note to do with organs
- Referring to organ being right way up
- Learn to play on an organ
- Right way back from waste processors
- Right way up in relation to wee producers
Buddy explains!

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 RENAL mean?
RENAL adjective- Pertaining to the kidneys.