Bubbly at pier, provided as a drink to whet one's appetite (8)
I believe the answer is:
aperitif
'a drink to whet one's appetite' is the definition.
I can't tell whether this definition defines the answer.
'bubbly at pier provided' is the wordplay.
'bubbly' indicates an anagram (I've seen this in other clues).
'provided' becomes 'if' (eg 'provided it's sunny' means 'if it's sunny').
'at'+'pier'='atpier'
'atpier' with letters rearranged gives 'aperit'.
'aperit'+'if'='APERITIF'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for aperitif that I've seen before include "An alcoholic drink before dinner, an appetiser" , "Alcoholic drink taken before meal" , "Appetite stimulant drink" , "Alcoholic drink to stimulate appetite" , "Appetising drink" .)