Strong stuff from vulgar licensee (6)
I believe the answer is:
garlic
'strong stuff' is the definition.
(garlic is known for its strong flavour and smell)
'from vulgar licensee' is the wordplay.
'from' indicates a hidden word.
'GARLIC' is hidden within 'vulgar licensee'.
(Other definitions for garlic that I've seen before include "Pungent bulb feared by vampires" , "Pungent bulb - vampires hate it" , "Kitchen additive" , "Flavouring plant" , "Pungent bulbs" .)