The most common and most likely answer to this crossword clue is the 10 letter word ASSESSMENT
I've seen this crossword clue in The Times
A
S
S
E
S
S
M
E
N
T
More clues leading to the result ASSESSMENT
- Nitwits excited, receiving marks for test
- Rating fools soldiers in outskirts of seaport
- Valuation of corrupt men’s assets
- Tax due? Mess sorted out in compliance
- Agree to cover up unfortunate mess in appraisal
- Appraisal idiots, people in the core of Ofsted
- Blockheads dispatched to take first part of maths test
- Tax to be paid twits posted, money included
- Amount to be paid to measure fellows’ model
- Inspectors’ appraisal fools people, in a way
Buddy explains!

The straight part
We know that "Rating" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rating = assessment.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 ASSESSMENT mean?
ASSESSMENT noun- The act of assessing or an amount (of tax, levy or duty etc) assessed.
- An appraisal or evaluation.