What's-his-name (2-3-2)
I believe the answer is:
so-and-so
'what's-his-name' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for so-and-so that I've seen before include "Unnamed person" , "No sodas for this unpleasant person" , "Person unknown or disapproved of" , "This/that person/thing" , "Difficult person - nobody in particular" .)