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Author’s
a
mug,
used
to
drink
a
lot
(5)
Author’s a mug, used to drink a lot (5)
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0
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0
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The whole clue is the definition (& lit or double definition).
How the clue works
Author's points you to Gertrude Stein, and then a mug, used to drink a lot is just a stein — one of those big German beer vessels. Two separate definitions, one answer.