Criminally bad football team introduces international talent (10)
I believe the answer is:
villainous
'criminally bad' is the definition.
'football team introduces international talent' is the wordplay.
'football team' becomes 'villa' (Aston Villa FC).
'introduces' says to take the initial letters (I've seen 'introducing' mean this).
'talent' becomes 'nous' (nous or common sense is a type of talent).
The first letter of 'international' is 'i'.
'villa'+'i'+'nous'='VILLAINOUS'
(Other definitions for villainous that I've seen before include "Nasty" , "really bad" , "criminal" , "dramatically bad" , "very unpleasant" .)