7 down
Scratching
surface
of
dark
side
in
barrel
(6)
Scratching surface of dark side in barrel (6)
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The definition is at the beginning of the clue.
How the clue works
Scratching surface is your definition — to key something is to scratch it, like someone running a key along a car door. For the wordplay, take dark side, which gives you YIN (as in yin and yang), and pop it inside barrel, which is KEG, to get KE-YIN-G.