You, I hear, again follow a mischief-maker that’s corrupted (6)
I believe the answer is:
impure
'corrupted' is the definition.
(thesaurus)
'you i hear again follow a mischief-maker' is the wordplay.
'i hear' indicates a 'sounds like' (homophone) clue.
'again' becomes 're' (prefix meaning 'again').
'follow' is a charade indicator (letters next to each other).
'a mischief maker' becomes 'imp' (I've seen this in other clues).
'you' sounds like 'u'.
'u'+'re'='ure'
'ure' after 'imp' is 'IMPURE'.
'that's' acts as a link.
(Other definitions for impure that I've seen before include "Unrefined" , "Contaminated or licentious" , "Assign a value to" , "Adulterated, tainted" , "Lewd" .)