Order regained after I dropped bomb (7)

I believe the answer is:

grenade

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'bomb' is the definition.
(grenade is a kind of bomb)

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

(Other definitions for grenade that I've seen before include "Small explosive device" , "Small hand-bomb" , "Small hand missile" , "Pineapple" , "Small bomb thrown by hand" .)

I've seen this clue in The Telegraph.

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