The most common and most likely answer to this crossword clue is the 8 letter word CLEANING
I've seen this crossword clue in The Daily Telegraph
C
L
E
A
N
I
N
G
Buddy explains!

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 CLEANING mean?
CLEANING verb- To remove dirt from a place or object.
- To tidy up, make a place neat.
- To remove equipment from a climbing route after it was previously lead climbed.
- To make things clean in general.
- To remove unnecessary files, etc. from (a directory, etc.).
- To brush the ice lightly in front of a moving rock to remove any debris and ensure a correct line; less vigorous than a sweep.
- To purge a raw of any blemishes caused by the scanning process such as brown tinting and poor color contrast.
- To remove guts and/or scales of a butchered animal.
- (gerund of clean) The process of making something clean.
- The afterbirth of cows, ewes, etc.