Drink from bag rejected by little sister (6)
I believe the answer is:
cassis
'drink' is the definition.
(I know that Cassis is a fruit drink)
'bag rejected by little sister' is the wordplay.
'bag' becomes 'sac' (a small bag).
'rejected' shows that the letters should be reversed in order.
'by' means one lot of letters go next to another.
'little sister' becomes 'sis' (synonyms. I am not sure about the 'little' bit.).
'sac' backwards is 'cas'.
'cas'+'sis'='CASSIS'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for cassis that I've seen before include "Syrupy blackcurrant liqueur" , "syrup drink" , "French blackcurrant mixer" , "Blackcurrant cordial" , "Liqueur made with blackcurrants" .)