Nasal inhaler (drug free) is manufactured (6)

I believe the answer is:

rhinal

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'nasal' is the definition.
(synonyms)

'inhaler drug free is manufactured' is the wordplay.
I cannot quite see how this works, but
'drug' could be 'rh' (Rh is an example) and 'rh' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for rhinal that I've seen is " Relating to the nose".)

I've seen this clue in The Independent.

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