Remove lead from dangerous light (4)

I believe the answer is:

airy

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

'light' is the definition.
(synonyms)

I can't explain the remainder of the clue.

(Other definitions for airy that I've seen before include "Flippant" , "Lacking substance" , "Jaunty - unsubstantial - offhand" , "Spacious; delicate" , "Spacious; nonchalant" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app