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Sure thing

Ross

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3 4 6 9

'sure thing' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for lock that I've seen before include "Hold < wisp of wool" , "Mechanism to keep closed, door say" , "Rugby player" , "tuft of wool" , "Door fastener or tuft of hair" .)

I've seen this clue in The Wall Street Journal and The New York Times.
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