Beyond the pale to entertain current idea (6)
I believe the answer is:
notion
'idea' is the definition.
(I know that idea can be written as notion)
'beyond the pale to entertain current' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'current' could be 'i' (symbol for electric current) and 'i' is present in the answer.
The remaining letters 'noon' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for notion that I've seen before include "Caprice" , "Whim or fancy" , "Vague idea or opinion" , "Vague understanding" , "desire" .)