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In the tube a constant light is seen (6)

Ross

I believe the answer is:

beacon

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

'light is seen' is the definition.
I can't tell whether this defines the answer.

'in the tube a constant' is the wordplay.
'in' indicates a hidden word.
'BEACON' can be found hidden inside 'tube a constant'.

Can you help me to learn more?

(Other definitions for beacon that I've seen before include "Fire on a hill, lit as a signal" , "Warning light on hill or cliff" , "Watch fire" , "Shiner" , "Raised signal fire or light" .)

I've seen this clue in The Irish News.
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