Hang in the air, regarding the open ocean (6)

I believe the answer is:

remain

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'hang in the air' is the definition.
'remain' can be an answer for 'hang' (thesaurus). I am not certain of the 'in the air' bit.

'regarding the open ocean' is the wordplay.
'regarding' becomes 'Re'.
'the open ocean' becomes 'main' (I've seen this in another clue).
're'+'main'='REMAIN'

Can you help me to learn more?

(Other definitions for remain that I've seen before include "Don't leave (the EU?)" , "Stay on after others have gone" , "Last" , "Airmen (anag.)" , "Stay (in position)" .)

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

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