Small drink to follow spiel (5,4)
I believe the answer is:
sales talk
'spiel' is the definition.
(thesaurus)
'small drink to follow' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'drink' becomes 'ale' (type of beer).
'to follow' becomes 'stalk' (stalk is a kind of follow).
's'+'ale'+'stalk'='SALES-TALK'
(Other definitions for sales talk that I've seen before include "lure to customer" , "promotional activity" , "Persuasive material" , "Pitch" .)