Terribly unclear type of weapon (7)

I believe the answer is:

nuclear

'type of weapon' is the definition.

'terribly unclear' is the wordplay.
'terribly' is an anagram indicator.
'unclear' with letters rearranged gives 'NUCLEAR'.

(Other definitions for nuclear that I've seen before include "one's immediate family?" , "Derived from fission or fusion" , "power source" , "Clue ran oddly to atomic" , "Like some physics" .)

I've seen this clue in The Irish Independent.

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