Crossword Genius

Signals with the lights (5)

Ross

I believe the answer is:

beams

This clue is a double definition.

'signals' is the first definition.
(beam is a kind of signal)

'the lights' is the second definition.
(beam is a kind of light)

'with' acts as a link.

(Other definitions for beams that I've seen before include "Shines" , "Smiles; joists" , "Smiles broadly or sunnily" , "Rays of light" .)

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app