Study into English wrongdoing gets support (8)
I believe the answer is:
evidence
'support' is the definition.
(I've seen this before)
'study into english wrongdoing' is the wordplay.
'study' becomes 'den' (term for a study or office).
'into' means one lot of letters goes inside another.
'english' becomes 'E' (abbreviation).
'wrongdoing' becomes 'vice' (vice is a kind of wrongdoing).
'e'+'vice'='evice'
'den' going inside 'evice' is 'EVIDENCE'.
'gets' acts as a link.
(Other definitions for evidence that I've seen before include "Information leading to proof" , "Knowledge on which to base belief" , "Facts on which to establish verdict" , "Indication" , "See 10" .)