Crossword Genius

Strangely, Trump (no politician) has use for this intellectual tome (9)

Ross

I believe the answer is:

thesaurus

'this intellectual tome' is the definition.
(type of reference book)

'strangely trump no politician has use' is the wordplay.
'strangely' indicates an anagram.
'no' is a deletion indicator.
'politician' becomes 'pm' (short for prime minister).
'trump' with 'pm' removed is 'tru'.
'tru'+'has'+'use'='truhasuse'
'truhasuse' with letters rearranged gives 'THESAURUS'.

'for' is the link.

(Other definitions for thesaurus that I've seen before include "Wordy gathering" , "Wordy book" , "work we may refer to" , "Volume of synonyms" , "Book listing synonyms" .)

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