Sachet for drink (3,3)
I believe the answer is:
tea bag
'sachet for drink' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tea bag that I've seen before include "Small sack for a brew-up" , "One for the pot" , "Sachet to put in pot" , "wherewithal for a drink" , "Beverage in an individual serving" .)