Well, I will get the salesman a drink in return (8)
I believe the answer is:
aperitif
'well' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'i will get the salesman a drink in return' is the wordplay.
'will' becomes 'fit' (I can't justify this - if you can you should believe this answer much more).
'get' says to put letters next to each other.
'the salesman' becomes 'rep' (sales rep).
'drink' is an insertion indicator.
'in return' shows that the letters should be reversed in order (return can mean to go backwards).
'fit'+'rep'+'a'='fitrepa'
'i' put within 'fitrepa' is 'fitirepa'.
'fitirepa' back-to-front is 'APERITIF'.
Can you help me to learn more?
(Other definitions for aperitif that I've seen before include "alcohol before meal" , "Drink stimulating the appetite" , "it leads to blow-out" , "appetizer" , "Preliminary drink" .)