Try swallowing wine with most flavour (8)
I believe the answer is:
tastiest
'try swallowing wine with most flavour' is the definition.
I can't tell whether this defines the answer.
'try swallowing wine' is the wordplay.
'try' becomes 'test' (synonyms).
'swallowing' means one lot of letters goes inside another.
'wine' becomes 'asti' (Italian wine).
'test' enclosing 'asti' is 'TASTIEST'.
Can you help me to learn more?
(Other definitions for tastiest that I've seen before include "Most delicious" , "Most savoury and toothsome" , "It's most pleasant" , "Most flavoursome" .)