Container that cheats, maybe? (6)
I believe the answer is:
Here is my best explanation:
'container' is the definition.
(sachet is a kind of container)
'cheats maybe?' is the subsidiary indication.
'maybe?' indicates an anagram.
'cheats' with letters rearranged gives 'sachet'.
'that' is the link.
(Other definitions for sachet that I've seen before include "Sealed bag or packet", "'Small soft packet, of pot-pourri perhaps (6)'", "Small packet (of, eg, shampoo)", "Small bag with sweet-smelling substance", "Bag", "'Small soft bag, for perfumed powder say (6)'", "Scent bag - shampoo envelope", "Small bag or sealed plastic pack", "Small bag or packet" and "Small sealed envelope".)