Guiding light (6)
'guiding light' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for beacon that I've seen before include "Fire on a hill, lit as a signal" , "Guilding light" , "Warning light on tower or hill" , "Signal light on hill" , "Watch fire" .)
'guiding light' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for north star that I've seen before include "feature of Ursa Minor" , "guiding light" , "navigational guide" , "Polaris" , "nickname of US State" .)