Explosive compound (3)

I think it could be either:

Which length description are you looking for?:

tnt

'explosive compound' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for tnt that I've seen before include "Explosive compound" , "Explosive stuff" , "Type of high explosive" , "Initially, powerful explosive" , "Very powerful explosive, compressed" .)

I've seen this clue in The Irish Times.

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