Something created in pint-sized drink (7)
I believe the answer is:
martini
'pint-sized drink' is the definition.
'martini' can be an answer for 'drink' (martini is a kind of drink). I'm not sure about the 'pint-sized' bit.
'something created in' is the wordplay.
'something' becomes 'marti' (I can't justify this - if you can you should believe this answer much more).
'created' is an anagram indicator (I've seen 'create' mean this).
'in' with letters rearranged gives 'ni'.
'marti'+'ni'='MARTINI'
Can you help me to learn more?
(Other definitions for martini that I've seen before include "Cocktail made with gin or vodka and vermouth" , "rifle" , "James Bond's drink of choice" , "Sienese painter" , "alcoholic drink" .)