Squirrel's discard (8)
I believe the answer is:
nutshell
'squirrel's discard' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nutshell that I've seen before include "Briefly, in one of these" , "One on almond" , "One makes a brief summary in one" , "Casing for kernel" , "Part of Brazil" .)