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Serve time inside lighthouse, maybe? (6)

Ross

I believe the answer is:

beacon

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This could be a double definition.

'serve time' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'lighthouse maybe?' is the second definition.
(I know that lighthouse is a type of beacon)

'inside' acts as a link.

Can you help me to learn more?

(Other definitions for beacon that I've seen before include "Warning light on hilltop" , "Warning, guiding, fire" , "Hill fire seen from a distance" , "Warning light on tower or hill" , "This may serve as a warning" .)

I've seen this clue in The Sun.
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