Studying wine, upset one over record year (8)
I believe the answer is:
oenology
'studying wine' is the definition.
(oenology is the study of wine)
'upset one over record year' is the wordplay.
'upset' is an anagram indicator.
'over record year' becomes 'ology' (I can't explain this - if you can you should believe this answer much more).
'one' anagrammed gives 'oen'.
'oen'+'ology'='OENOLOGY'
(Other definitions for oenology that I've seen before include "The science of wines" , "The study of wine making" , "Wine knowledge" , "The art of wine making" .)