Studied 'Introduction to Plato' with hesitation? Not new! (7)
I believe the answer is:
perused
'studied' is the definition.
(I've seen this before)
'introduction to plato with hesitation? not new' is the wordplay.
'introduction to' indicates taking the first letters (I've seen 'introductions to' mean this).
'with hesitation?' becomes 'er' (I've seen this in other clues).
'not new' becomes 'used' (I've seen this before).
The first letter of 'plato' is 'p'.
'p'+'er'+'used'='PERUSED'
(Other definitions for perused that I've seen before include "Studied" , "Read (something) very carefully" , "Scanned" , "Browsed" .)