19 down
Old
drunkard
beats
wino
up
(7)
Old drunkard beats wino up (7)
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The definition is at the beginning of the clue.
How the clue works
Old drunkard is the definition — a tosspot is an old word for a boozer. Take TOPS ("beats") followed by SOT ("wino") and reverse the lot (indicated by "up"): TOPSSOT flipped round gives TOSSPOT.