Try out wine with most flavour (8)
I believe the answer is:
tastiest
'try out wine with most flavour' is the definition.
I can't tell whether this definition defines the answer.
'try out wine' is the wordplay.
'try' becomes 'test' (synonyms).
'out' is an insertion indicator.
'wine' becomes 'asti' (Italian wine).
'test' going around 'asti' is 'TASTIEST'.
Can you help me to learn more?
(Other definitions for tastiest that I've seen before include "Most savoury and toothsome" , "Most delicious" , "It's most pleasant" , "Most flavoursome" .)