ft 12,335

[addicted12]

12d These clues may be ancient (6)
L?G?T?. I assume it is Ancient but would appreciate an explanation. Thanks.

[kettledrum]

Ancient lights is a legal term meaning the right to receive in perpetuity a reasonable amount of daylight through certain windows.
Lights are clues in crossword-speak

[addicted12]

Thank you kettledrum. I hadn't come across that use of lights before.