Come inside for gas mask (6)

I believe the answer is:

orgasm

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'come inside for gas mask' is the definition.
I can't judge whether this definition defines the answer.

'inside for gas mask' is the wordplay.
'inside' indicates the answer is hidden within the clue.
'ORGASM' is hidden within 'for gas mask'.

Can you help me to learn more?

(Other definitions for orgasm that I've seen before include "Fit of intense excitement" , "Practising conjugation may achieve it" , "Immoderate excitement" , "Bout of intense excitement" .)

I've seen this clue in The Independent.

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