Try out part of this puzzle solver (3)
I believe the answer is:
you
'puzzle solver' is the definition.
'you' can be an answer for 'solver' (the person solving the crossword). I am not sure about the 'puzzle' bit.
'try out part of' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'YOU' is hidden in the letters of 'try out'.
'this' acts as a link.
Can you help me to learn more?
(Other definitions for you that I've seen before include "Thee" , "The solver" , "Reader" , "whoever's reading this" , "Neither me, nor him" .)