Crossword Genius

Learn arrangement of the kidneys (5)

Ross

I believe the answer is:

renal

Here is my best explanation:

'of the kidneys' is the definition.
(I've seen this before)

'learn arrangement' is the wordplay.
'arrangement' is an anagram indicator.
'learn' with letters rearranged gives 'RENAL'.

This clue was last seen in Mirror