Not half incautious, producing alcoholic drink (4)
I believe the answer is:
cava
'alcoholic drink' is the definition.
(cava is a type of wine)
'not half incautious' is the wordplay.
'not half' suggests halving the letters.
'incautious' becomes 'cavalier' (cavalier can mean casual or careless).
'cavalier' with half the letters taken is 'CAVA'.
'producing' is the link.
(Other definitions for cava that I've seen before include "Sparkler" , "sparkling drink" , "Spanish sparkling white wine" , "Spanish bubbly" , "Spanish fizz" .)