Crossword Genius

Land heralded by guiding star? (7,5)

Ross

I believe the answer is:

leading light

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

'guiding star?' is the definition.
'leading light' can be an answer for 'star?' (I've seen this before). I'm unsure of the 'guiding' bit.

'land heralded by' is the wordplay.
'land' becomes 'light' (lighting is a kind of landing).
'heralded' becomes 'leading'.
'by' means one lot of letters go next to another.
'light' put after 'leading' is 'LEADING LIGHT'.

Can you help me to learn more?

(Other definitions for leading light that I've seen before include "Such a person's great standing" , "went before certain sages" , "may be an appropriate description of this answer" , "notable" , "Is an usher one" .)

I've seen this clue in The Telegraph.
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