Crossword Genius

He's among group of stars in reference book (9)

Ross

I believe the answer is:

thesaurus

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'reference book' is the definition.
(I know that thesaurus is a type of thematic dictionary)

'he's among group of stars' is the wordplay.
'among' means one lot of letters goes inside another.
'group of stars' becomes 'taurus' (I can't justify this - if you can you should believe this answer much more).
'hes' placed into 'taurus' is 'THESAURUS'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for thesaurus that I've seen before include "Wordy gathering" , "Book of words with synonyms, antonyms etc" , "Reference book" , "Reference work" , "Book listing synonyms" .)

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