He, when cold, is quite ill, wanting temperature humid, possibly (6,6)

I believe the answer is:

liquid helium

I'm a little stuck... Click here to teach me more about this clue!

'he when cold' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'quite ill wanting temperature humid possibly' is the wordplay.
'wanting' indicates named letters should be taken away (wanting can mean lacking).
'temperature' becomes 't' (abbreviation).
'possibly' indicates an anagram.
'quite'+'ill'='quiteill'
'quiteill' with 't' removed is 'quieill'.
'quieill'+'humid'='quieillhumid'
'quieillhumid' anagrammed gives 'LIQUID HELIUM'.

'is' is the link.

Can you help me to learn more?

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.