Crossword Genius

In the tube a constant light (6)

Ross

I believe the answer is:

beacon

'light' is the definition.
(I've seen this before)

'in the tube a constant' is the wordplay.
'in' says the answer is hidden in the clue.
'BEACON' is hidden in the letters of 'tube a constant'.

(Other definitions for beacon that I've seen before include "Prominent light on a hill" , "Warning fire or signal" , "Guiding light?" , "Raised signal fire or light" , "Watch fire" .)

I've seen this clue in The Telegraph.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.