Particularly for the highest of the high (5,3)

I believe the answer is:

above all

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'particularly' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for above all that I've seen before include "First and foremost" , "at the end of the day?" , "Supremely" , "primarily" , "Especially" .)

I've seen this clue in the Evening Standard.

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