The most common and most likely answer to this crossword clue is the 9 letter word MEASURING
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More clues leading to the result MEASURING
Buddy explains!

The straight part
We know that "Evaluating" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case evaluating = measuring.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 MEASURING mean?
MEASURING verb- To ascertain the quantity of a unit of material via calculated comparison with respect to a standard.
- To be of (a certain size), to have (a certain measurement)
- To estimate the unit size of something.
- To judge, value, or appraise.
- To obtain or set apart; to mark in even increments.
- To traverse, cross, pass along; to travel over.
- To adjust by a rule or standard.
- To allot or distribute by measure; to set off or apart by measure; often with out or off.
- Act of measurement.