Half of them lie in showers or hang in the air (6)

I believe the answer is:

remain

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

'hang in the air' is the definition.
'remain' can be an answer for 'hang' (thesaurus). I'm not sure about the 'in the air' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for remain that I've seen before include "Stay, don't go" , "Survive" , "Stay (in a place)" , "stop behind?" , "Stay on after others have gone" .)

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

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