Settles for “Having no head for air travel” (6)

I believe the answer is:

lights

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

'settles' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

(Other definitions for lights that I've seen before include "Blackpool is known for such" , "Ignites or illumines" , "Sources of illumination" , "Lamps" , "Lungs of sheep, pigs etc used as food" .)

I've seen this clue in the Evening Standard.

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