Crossword Genius

Cryptic end in sight? Rush and use a reference book (9)

Ross

I believe the answer is:

thesaurus

'reference book' is the definition.
(thesaurus is a kind of reference book)

'cryptic end in sight? rush and use a' is the wordplay.
'cryptic' indicates an anagram (I've seen this in other clues).
'end in' indicates one should take the final letters.
'and' says to put letters next to each other.
The last letter of 'sight' is 't'.
't'+'rush'+'use'+'a'='trushusea'
'trushusea' is an anagram of 'THESAURUS'.

(Other definitions for thesaurus that I've seen before include "Book of words with synonyms, antonyms etc" , "storehouse" , "Dictionary" , "Wordbook" , "treasury" .)

I've seen this clue in The Independent.
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