Healthy, mentioned being ventilated (4-5)

'ventilated' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'healthy mentioned being' is the wordplay.
I cannot really see how this works, but
'healthy' could be 'well' (associated in meaning) and 'well' is found within the answer.
'being' could be 'red' (red is a kind of being) and 'red' is present in the answer.
The remaining letters 'ai' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?