Threatened when deleting number getting blocked? (7)

I believe the answer is:

impeded

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'blocked?' is the definition.
(blocking is a kind of impeding)

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

(Other definitions for impeded that I've seen before include "Held up" , "Blocked (progress)" , "Blocked, hindered" , "Got in the way of" , "Hindered, slowed down" .)

I've seen this clue in The Irish Times.

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