The most common and most likely answer to this crossword clue is the 7 letter word PRETZEL
I've seen this crossword clue in The Times
P
R
E
T
Z
E
L
Buddy explains!

The straight part
We know that "savoury biscuit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case savoury biscuit = pretzel.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PRETZEL mean?
PRETZEL noun- A toasted bread or cracker usually in the shape of a loose knot.
- (by extension) Anything that is knotted, twisted, or tangled.
- To bend, twist, or contort.