Crossword Genius

In essence; in a .......... (8)

Ross

I believe the answer is:

nutshell

(Other definitions for nutshell that I've seen before include "Ten hulls (anag)" , "Brief facts" , "Hard carapace around small fruits" , "In which the case is put concisely" , "in case of compressed information" .)

I've seen this clue in the Sydney Morning Herald.
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