Cryptic crossword clue
Machinations of Belgian in Poirot ultimately impossible to grasp 10

The most common and most likely answer to this crossword clue is the 10 letter word INTANGIBLE

I've seen this crossword clue in The Guardian
I
N
T
A
N
G
I
B
L
E

Buddy explains!

The straight part
We know that "impossible to grasp" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case impossible to grasp = intangible.
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 INTANGIBLE mean?

INTANGIBLE noun
  1. Anything intangible
  2. Incorporeal property that is saleable though not material, such as bank deposits, stocks, bonds, and promissory notes
INTANGIBLE adjective
  1. Incapable of being perceived by the senses; incorporeal

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