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Very
anxious
when
building
house?
(8,2)
Very anxious when building house? (8,2)
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The whole clue is the definition (& lit or double definition).
How the clue works
The definition is Very anxious — "bricking it" being the slang for being absolutely terrified. Then building house? points to the literal act of laying bricks, which gets you to exactly the same place. Both halves are defining the answer independently, so this is a double definition.