26 across
Much
recovered,
I’ll
wager
(6)
Much recovered, I’ll wager (6)
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The whole clue is the definition (& lit or double definition).
How the clue works
The definition Much recovered gives you BETTER in the health sense, and then I'll wager points to a BETTER — someone who places bets. Two completely different meanings, one word, sitting neatly at either end of the clue.