Dispersed, deep in her asthma remedy (9)

I believe the answer is:

ephedrine

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'asthma remedy' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'dispersed deep in her' is the wordplay.
'dispersed' is an anagram indicator.
'deep'+'in'+'her'='deepinher'
'deepinher' is an anagram of 'EPHEDRINE'.

Can you help me to learn more?

(Other definitions for ephedrine that I've seen before include "Bronchitis/asthma drug" , "Drug used for asthma and hay fever" , "Stimulant" .)

I've seen this clue in The Daily Express.

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