Whence the ball comes in from an angle (6)

I believe the answer is:

corner

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'angle' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for corner that I've seen before include "Where two lines or walls meet" , "Point where two lines meet" , "Point where two walls meet" , "[SPOT]" , "Where rook is immobilised, initially" .)

I've seen this clue in the Evening Standard.

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