The most common and most likely answer to this crossword clue is the 13 letter word EXTRAPOLATING
I've seen this crossword clue in The Times
E
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Buddy explains!

The straight part
We know that "Inferring from" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case inferring from = extrapolating.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 EXTRAPOLATING mean?
EXTRAPOLATING verb- To infer by extending known information.
- To estimate the value of a variable outside a known range from values within that range by assuming that the estimated value follows logically from the known ones