Smack on behind produces lingering sensation (10)
I believe the answer is:
aftertaste
'lingering sensation' is the definition.
(taste that remains after eating or drinking)
'smack on behind' is the wordplay.
'smack' becomes 'taste' (to smack of something is to taste of it).
'on' means one lot of letters go next to another.
'behind' becomes 'after' (I've seen this before).
'taste' after 'after' is 'AFTERTASTE'.
'produces' is the link.
(Other definitions for aftertaste that I've seen before include "Lingering sensation in mouth" , "Relish experienced" , "Lingering impression" , "lingering flavour" , "What lingers in the mouth" .)