Invalid phobic with ray of clinical chamber (9)

I believe the answer is:

hypobaric

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'invalid phobic with ray of clinical chamber' is the definition.
I can't tell whether this definition defines the answer.

'invalid phobic with ray' is the wordplay.
'invalid' is an anagram indicator.
'with' means one lot of letters go next to another.
'phobic'+'ray'='phobicray'
'phobicray' with letters rearranged gives 'HYPOBARIC'.

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I've seen this clue in the Sydney Morning Herald.

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