Snatch letters, reportedly (5)

I believe the answer is:

seize

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'snatch' is the definition.
(I know that snatch is a more specific form of seize)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for seize that I've seen before include "Nobble" , "Confiscate" , "Clutch" , "a sweet number in Grenoble, say" , "Grasp firmly" .)

I've seen this clue in The Times.

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