Rejecting some cappuccino for tea (5)
I believe the answer is:
cuppa
'tea' is the definition.
(I know that cuppa is a type of tea)
'rejecting some cappuccino for' is the wordplay.
'rejecting' says the letters should be written in reverse.
'some' says the answer is hidden in the clue (some parts of the word are used).
'appuc' can be found hidden inside 'cappuccino for'.
'appuc' reversed gives 'CUPPA'.
(Other definitions for cuppa that I've seen before include "Refreshing brew" , "Drink of tea (informal)" , "Drink of tea (colloq.)" .)