Lasting radiance shaking Great Wolf (9)
I believe the answer is:
afterglow
'lasting radiance' is the definition.
The answer and definition can be both types of natural phenomena as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'shaking great wolf' is the wordplay.
'shaking' indicates an anagram.
'great'+'wolf'='greatwolf'
'greatwolf' with letters rearranged gives 'AFTERGLOW'.
Can you help me to learn more?
(Other definitions for afterglow that I've seen before include "appearing when sun has set?" , "trace of sunset" , "Light, lingering" , "following which gloom sets in?" , "fading light" .)