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Surveillance operation ditching Sierra or Escort (4,3)

Ross

I believe the answer is:

take out

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

I don't understand the rest of the clue.

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(Other definitions for take out that I've seen before include "Extract; kill" , "Remove; escort" , "Remove from within" , "Bump off" , "Kill (colloq.)" .)

I've seen this clue in The Times.
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