Football club I sense is very bad (10)
I believe the answer is:
villainous
'very bad' is the definition.
'football club i sense' is the wordplay.
'football club' becomes 'Villa' (Aston Villa FC).
'sense' becomes 'nous' (nous is a kind of sense).
'villa'+'i'+'nous'='VILLAINOUS'
'is' is the link.
(Other definitions for villainous that I've seen before include "criminal" , "really bad" , "very unpleasant" , "dramatically bad" , "Nasty" .)