Savvy about wine (6)
I believe the answer is:
report
'savvy' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'about wine' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'wine' becomes 'port' (port wine is a kind of wine).
're'+'port'='REPORT'
Can you help me to learn more?
(Other definitions for report that I've seen before include "'Description, account (6)'" , "Announce; gunshot" , "Explosion" , "Make a complaint about (someone)" , "Narrative given by porter" .)