Cryptic crossword clue
Deepest part of script in story likely to crumble 7

The most common and most likely answer to this crossword clue is the 7 letter word FRIABLE

I've seen this crossword clue in The Guardian
F
R
I
A
B
L
E

Buddy explains!

The straight part
We know that "likely to crumble" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case likely to crumble = friable.
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 FRIABLE mean?

FRIABLE adjective
  1. Easily broken into small fragments, crumbled, or reduced to powder.
  2. (of soil) Loose and large-grained in consistency.
  3. (of poisons) Likely to crumble and become airborne, thus becoming a health risk
  4. (of a number) Smooth: that factors completely into small prime numbers.

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