Crossword Genius

Normal, presumably, to inject sulphur to bring pet relief (7)

Ross

I believe the answer is:

nostrum

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

'relief' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for nostrum that I've seen before include "Phoney panacea" , "Favourite remedy or scheme" , "secret potion" , "Some think it helps" , "Quack cure" .)

I've seen this clue in The Times.
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