Unit rottweiler hides explosive (5)

I believe the answer is:

nitro

'explosive' is the definition.
(short for nitroglycerine)

'unit rottweiler hides' is the wordplay.
'hides' says the answer is hidden in the clue.
'NITRO' is hidden in the letters of 'unit rottweiler'.

(Other definitions for nitro that I've seen before include "explosive material" , "Explosive liquid" , "The whole universe" .)

I've seen this clue in The Telegraph.

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