This, this and this (5)
I believe the answer is:
these
'this this and this' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for these that I've seen before include "The persons or things here" , "Plural form of this" , "See 13" , "Sheet (anag) -- pronoun" , "The items indicated here" .)