8 down
Attempt
to
extract
everything
from
onion
(4)
Attempt to extract everything from onion (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Attempt, giving you SHOT. For the wordplay, take SHALLOT (a type of onion) and pull out ALL (everything) from inside it, and you're left with SHOT.