27 across
Go
away
from
pack,
pursuing
south
(5)
Go away from pack, pursuing south (5)
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The definition is at the beginning of the clue.
How the clue works
"Go away" is your definition, meaning to clear off sharpish. For the wordplay, take S (the abbreviation for south), then stick CRAM (to pack) after it - "pursuing" tells you CRAM follows south - and south plus CRAM gives you the answer.