It helps asthmatics in hospital with real shivers (7)

I believe the answer is:

inhaler

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'it helps asthmatics' is the definition.
The definition suggests a singular noun which matches the answer.

'in hospital with real shivers' is the wordplay.
'hospital' becomes 'h' (abbreviation for hospital on maps).
'with' says to put letters next to each other.
'shivers' indicates an anagram (I've seen 'shivering' mean this).
'real' anagrammed gives 'aler'.
'in'+'h'+'aler'='INHALER'

Can you help me to learn more?

(Other definitions for inhaler that I've seen before include "Device for, eg, asthma sufferer" , "Medical aid" , "Asthmatic's aid" , "Respiratory aid" , "Drug dispenser" .)

I've seen this clue in The Telegraph.

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