Crossword Genius

Vet goes short with urinal tissue, naturally (9)

Ross

I believe the answer is:

neuroglia

I'm a little stuck... Click here to teach me more about this clue!

'tissue naturally' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Maybe you can see an association between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for neuroglia that I've seen is " nerves".)

I've seen this clue in the Sydney Morning Herald.
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