Sick individual, and cold - it's unlawful (7)
I believe the answer is:
illicit
'unlawful' is the definition.
('illicit' can be a synonym of 'unlawful')
'sick individual and cold it's' is the wordplay.
'sick' becomes 'ill' ('ill' can be a synonym of 'sick').
'individual' becomes 'i'.
'and' says to put letters next to each other.
'cold' becomes 'c' (eg on taps).
'it's' becomes 'it' (I've seen this in other clues**).
'ill'+'i'+'c'+'it'='ILLICIT'
(Other definitions for illicit that I've seen before include "Bootleg; clandestine" , "Illegal" , "wrong" , "Not lawful" , "Felonious" .)