The most common and most likely answer to this crossword clue is the 10 letter word UNDERTAKER
I've seen this crossword clue in Independent
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Buddy explains!
The straight part
We know that "I bury/someone who’s passed in an unconventional manner?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case i bury/someone who’s passed in an unconventional manner? = undertaker.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 UNDERTAKER mean?
UNDERTAKER noun- A funeral director; someone whose business is to manage funerals, burials and cremations.
- A person receiving land in Ireland during the Elizabethan era, so named because they gave an undertaking to abide by several conditions regarding marriage, to be loyal to the crown, and to use English as their spoken language.
- A contractor for the royal revenue in England, one of those who undertook to manage the House of Commons for the king in the Addled Parliament of 1614.
- One who undertakes or commits to doing something.