The most common and most likely answer to this crossword clue is the 10 letter word MULTIPLIES
I've seen this crossword clue in The Sunday Telegraph
M
U
L
T
I
P
L
I
E
S
Buddy explains!

The straight part
We know that "Finds product" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case finds product = multiplies.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 MULTIPLIES mean?
MULTIPLIES noun- An act or instance of multiplying.
- To increase the amount, degree or number of (something).
- (with by) To perform multiplication on (a number).
- To grow in number.
- To breed or propagate.
- To perform multiplication.
- To be a factor in a multiplication with (another factor).