Ailing individual recalled jerk suggesting it's unlawful (7)
I believe the answer is:
illicit
'it's unlawful' is the definition.
(similar in meaning)
'ailing individual recalled jerk' is the wordplay.
'ailing' becomes 'ill' (similar in meaning).
'individual' becomes 'i' (Roman numeral for one, ie individual).
'recalled' says the letters should be written backwards (to recall can mean to bring something back).
'jerk' becomes 'tic' (jerking movement by the body).
'tic' written backwards gives 'cit'.
'ill'+'i'+'cit'='ILLICIT'
'suggesting' acts as a link.
(Other definitions for illicit that I've seen before include "Illegal" , "completely banned" , "Contraband" , "Contrary to or forbidden by law" , "Forbidden by law, rules" .)