Signal folder can provide something enthralling (11)
I believe the answer is:
spellbinder
'signal folder' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'can provide something enthralling' is the wordplay.
I cannot really see how this works, but
'can' could be 'bin' (I've seen this in other clues) and 'bin' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for spellbinder that I've seen before include "A fascinating one" , "Enthralling speaker" , "Gifted orator" .)