Crossword Genius

Explosive device (4)

Ross

There are a few possibilities for this:

Which length description are you looking for?:

4 7 9 5,6

6,4

'explosive device' is the definition.
(I know that letter bomb is a type of bomb)

This is all the clue.

(Other definitions for letter bomb that I've seen before include "Dangerous post" , "Shocking missive!" .)

I've seen this clue in The Mirror.
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