Bonus drink after an assortment of Italian morsels (9)
I believe the answer is:
antipasti
'assortment of italian morsels' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'bonus drink after an' is the wordplay.
'bonus drink' becomes 'anti' (I am not sure about this - if you are sure you should believe this answer much more).
'after' becomes 'past' (I've seen this in other clues).
'an' becomes 'i' (Roman numeral for one).
'anti'+'past'+'i'='ANTIPASTI'
Can you help me to learn more?
(Other definitions for antipasti that I've seen before include "Italian appetisers" , "starters in Rome" , "that's served in trattoria" , "Italian food selection" , "first course" .)