Second person to sound like a sheep (3)
I believe the answer is:
Here is my best explanation:
'second person' is the definition.
(I've seen this before)
'sound like a sheep' is the wordplay.
'sound like' shows a homophone (sound like).
'a sheep' becomes 'ewe' (ewe is a kind of sheep).
'ewe' is a homophone of 'YOU'.
'to' is the link.
(Other definitions for you that I've seen before include "whoever's reading this", "My solvers in general", "Person speaker addresses", "Second person pronoun", "The audience as addressed by speaker", "Second-person pronoun", "The solver", "Personal pronoun", "Thee" and "Anyone".)