Maybe spend time inside lighthouse? (6)
I believe the answer is:
beacon
'lighthouse?' is the definition.
(synonyms)
I don't understand how the rest of the clue works.
(Other definitions for beacon that I've seen before include "Radio transmitter for positioning" , "Fire on a hill, lit as a signal" , "Hilltop signal fire" , "Warning, guiding, fire" , "Hill fire seen from a distance" .)