Highest or best (7)

I believe the answer is:

topmost

I believe this clue is a double definition.

'highest' is the first definition.
(I've seen this in another clue)

'best' is the second definition.
(thesaurus)

(Other definitions for topmost that I've seen before include "Highest" , "Supreme" .)

I've seen this clue in The Mirror.

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