11 across
Author
as
boxer,
could
one
say
–
heavyweight
(10)
Author as boxer, could one say – heavyweight (10)
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The definition is at the beginning of the clue.
How the clue works
The definition is Author — that's G.K. Chesterton. For the wordplay, think of a boxer as someone who chests things up, giving you CHESTER (with could one say winking at that playful little coinage), then tag on heavyweight, which gives you TON, and the two pieces sit together nicely.