6 down
Over
in
beer
garden
at
the
back
knocking
back
port
wine
(5,4)
Over in beer garden at the back knocking back port wine (5,4)
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The definition is at the end of the clue.
How the clue works
Look at wine at the end — that's what you're after. "Over" gives you O, and that goes inside beer (PINT) to make PINOT; then garden at the back plucks the last letter of gardeN, giving you N. Finally, port is RIO, and knocking back reverses it to OIR, so you get NOIR.