Drink killed off most of team (4,3)
I believe the answer is:
iced tea
'drink' is the definition.
(iced tea is a kind of drink)
'killed off most of team' is the wordplay.
'killed off' becomes 'iced' (ice can informally mean to assassinate. I am not sure about the 'off' bit.).
'most of' means to remove the last letter.
'team' with its last letter taken off is 'tea'.
'iced'+'tea'='ICED TEA'
Can you help me to learn more?
(Other definitions for iced tea that I've seen before include "Cold summer drink" , "Chilled drink" , "Cool drink" .)