Band of light finally disappearing (4)

I believe the answer is:

torc

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

'light finally disappearing' is the wordplay.
'finally' suggests the final letters.
'disappearing' becomes 'orc' (I can't explain this - if you can you should believe this answer much more).
The last letter of 'light' is 't'.
't'+'orc'='TORC'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for torc that I've seen before include "Twisted metal neck band" , "Celtic metal neck-ring" , "One gets into a twist" , "Rigid circular necklace" , "Metal neck ornament of ancient Britons" .)

I've seen this clue in The Guardian.

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