Learn new form of treatment for kidneys (5)

I believe the answer is:

renal

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'form of treatment for kidneys' is the definition.
I can't tell whether this defines the answer.

'learn new' is the wordplay.
'new' indicates anagramming the letters.
'learn' anagrammed gives 'RENAL'.

Can you help me to learn more?

(Other definitions for renal that I've seen before include "Pertaining to the kidneys" , "connected with organ" , "Referring to organ" , "Vital organ's" , "associated with organ" .)

I've seen this clue in The Globe and Mail.

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