Unclear about form of power (7)

I believe the answer is:

nuclear

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'form of power' is the definition.
'nuclear' can be an answer for 'power' (nuclear power is a kind of power). I am unsure of the 'form of' bit.

'unclear about' is the wordplay.
'about' indicates an anagram.
'unclear' with letters rearranged gives 'NUCLEAR'.

Can you help me to learn more?

(Other definitions for nuclear that I've seen before include "Relating to atomic weapons" , "Relating to atomic energy" , "Relating to part of atom" , "Concerning subatomic particles" , "Derived from fission or fusion" .)

I've seen this clue in The Mirror.

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