Knot-shaped cracker (7)
I believe the answer is:
pretzel
'knot-shaped cracker' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for pretzel that I've seen before include "Crisp salted biscuit" , "Glazed, salted and twisted cracker" , "Glazed biscuit shape of a loose knot" , "Salted biscuit, shaped like a knot" , "Curly savoury biscuit" .)