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Particularly the highest (5,3)

Ross

I believe the answer is:

above all

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'particularly' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(Other definitions for above all that I've seen before include "Like the managing director" , "Notably" , "Mainly" , "What 18 [EVEREST] is" , "Shakespeare: 'This . . . . . . . ., to thine own self be true'" .)

I've seen this clue in The Guardian, The Globe and Mail and The Telegraph.
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