Cryptic crossword clue
Free from grime when brought into class 8

The most common and most likely answer to this crossword clue is the 8 letter word DEGREASE

I've seen this crossword clue in The Daily Telegraph
D
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Buddy explains!

The straight part
We know that "Free from grime" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case free from grime = degrease.
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 DEGREASE mean?

DEGREASE verb
  1. To remove grease from something.

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