Let her ask the thesaurus chap (5)

I believe the answer is:

roget

(Other definitions for roget that I've seen before include "Thesaurus publisher" , "English doctor, compiler of a thesaurus, d. 1869" , "Thesaurus deviser" , "Thesaurus inventor" , "man of many words" .)

I've seen this clue in The Times.

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