Cryptic crossword clue
Commercial study ultimately found quantity contributing to total 6

The most common and most likely answer to this crossword clue is the 6 letter word ADDEND

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The straight part
We know that "quantity contributing to total" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case quantity contributing to total = addend.
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 ADDEND mean?

ADDEND noun
  1. Any one of two or more numbers or other terms that are to be added together.
  2. A moiety added to another molecule.
ADDEND verb
  1. To furnish with an addendum.
  2. To furnish with an addend.

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