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Primarily where dictionaries list alkyne? (5,3)

Ross

I believe the answer is:

above all

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'primarily' is the definition.
(above all can mean primarily or especially)

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 "primarily" , "Notably" , "Especially" , "at the end of the day?" , "Hamlet : 'This . . . . . . . ., to thine own self be true'" .)

I've seen this clue in The Sunday Times and The Times.
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