Cryptic crossword clue
Mostly understanding about old man’s body, mortician leads funeral 10

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

I've seen this crossword clue in The Guardian
E
N
T
O
M
B
M
E
N
T

Buddy explains!

The straight part
We know that "funeral" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case funeral = entombment.
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 ENTOMBMENT mean?

ENTOMBMENT noun
  1. The act of entombing or the state of being entombed
  2. The decommissioning of a radioactive site by encasing it in concrete

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