Increasingly rowdy yob almost upset wine (6)
I believe the answer is:
louder
'increasingly rowdy yob almost upset wine' is the definition.
I can't tell whether this defines the answer.
'yob almost upset wine' is the wordplay.
'yob' becomes 'lout' (both can mean an antisocial young man).
'almost' means to remove the last letter (most of the word but not all of it).
'upset' says the letters should be written backwards.
'wine' becomes 'red wine' (red is a type of wine).
'red' back-to-front is 'der'.
'lout' with its final letter taken off is 'lou'.
'lou'+'der'='LOUDER'
Can you help me to learn more?
(Other definitions for louder that I've seen before include "'Actions speak . . . . . . than words'" , "Noisier or gaudier" , "Sound of greater volume" , "More noisy or bright" .)