Crossword Genius

Puffer at home gets healthier (7)

Ross

I believe the answer is:

inhaler

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

'home gets healthier' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'gets' is a charade indicator (letters next to each other).
'healthier' becomes 'haler' ('hale' can be similar in meaning to 'healthy').
'in'+'haler'='INHALER'

'at' acts as a link.

Can you help me to learn more?

(Other definitions for inhaler that I've seen before include "Uninhibited smoker" , "Medical device" , "Dispenser of vapour for the nose or lungs" , "Asthmatic's device" , "way of taking drugs" .)

I've seen this clue in The Guardian.
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