Note with special order for this or that fellow (2-3-2)
I believe the answer is:
so-and-so
'fellow' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'note with special order for this or' is the wordplay.
I cannot quite see how this works, but
'note' could be 'so' (musical note) and 'so' is found within the answer.
'with' could be 'and' and 'and' is located in the answer.
'special' could be 's' (common abbreviation as in Special Air Service) and 's' is found in the answer.
'order' could be 'o' (abbreviation e.g. in British honours OM, OBE etc.) and 'o' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'that' is the link.
Can you help me to learn more?
(Other definitions for so-and-so that I've seen before include "Right little rascal!" , "Disfavoured person" , "Difficult person - nobody in particular" , "Someone or other - unpleasant person!" , "Unnamed person" .)