Upper class wines blended in rash style (6)
I believe the answer is:
unwise
'upper class wines blended in rash style' is the definition.
I can't judge whether this defines the answer.
'upper class wines blended in' is the wordplay.
'upper class' becomes 'u' (as in U- and non-U speech).
'blended' indicates an anagram.
'in' means one lot of letters goes inside another.
'wines' anagrammed gives 'nwise'.
'u' placed inside 'nwise' is 'UNWISE'.
Can you help me to learn more?
(Other definitions for unwise that I've seen before include "Not sensible or prudent" , "Injudicious" , "Not sensible, foolish" , "Ill-judged" , "Lacking sound judgement, maybe foolish" .)