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Dumbfounded
there
is
no
address?
(10)
Dumbfounded there is no address? (10)
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The whole clue is the definition (& lit or double definition).
How the clue works
Dumbfounded there is no address? is the whole clue working as a cryptic definition. "Dumbfounded" gives you the sense of being unable to speak, and "no address" cheekily plays on address meaning a speech — so nowhere to give one.