The most common and most likely answer to this crossword clue is the 8 letter word SOURCING
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Buddy explains!

The straight part
We know that "Finding origin of" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case finding origin of = sourcing.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 SOURCING mean?
SOURCING verb- To obtain or procure: used especially of a business resource.
- To find information about (a quotation)'s source (from which it comes): to find a citation for.
- The process by which something is sourced, or obtained from another place.
- The supply of resources needed by a business process.