Crossword Genius

Is Grant's boss in 1 down, for example? (4,4)

Ross

I believe the answer is:

star sign

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

'1 down for example?' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'is grant's boss' is the wordplay.
'is grant's' anagrams to 'STAR SIGN'.
But, I am not sure how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for star sign that I've seen before include "Astrological house" , "Leo perhaps" , "Cancer or Capricorn, say" , "Eg, Sagittarius" , "One area into which the zodiac is divided" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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