Pouch (3)
'pouch' is the definition.
(I know that pouch can be written as sac)
This is all the clue.
(Other definitions for sac that I've seen before include "Traditional entitlement to hold court" , "Bag-like part in animal or plant" , "Membranous cavity" , "Bodily cavity enclosed by a membrane" , "Pouch in the body" .)
(Other definitions for bag that I've seen before include "Quantity of game shot in a particular period" , "Gladstone, for example" , "interest" , "Sack" , "Carrier" .)
'pouch' is the definition.
(I know that pocket is a type of pouch)
This is the entire clue.
(Other definitions for pocket that I've seen before include "Pouch in garment" , "Part of a billiard table" , "Pot a snooker ball into the ....." , "Snooker table hole" , "Portable in coat, small" .)
(Other definitions for sachet that I've seen before include "'Small soft bag, for perfumed powder say (6)'" , "Small bag with sweet-smelling substance" , "Small packet (of, eg, shampoo)" , "Sealed bag or packet" , "Chaste as a sealed plastic bag" .)