The most common and most likely answer to this crossword clue is the 6 letter word PARING
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More clues leading to the result PARING
Buddy explains!

The straight part
We know that "cutting back" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cutting back = paring.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 PARING mean?
PARING verb- To remove the outer covering or skin of something with a cutting device, typically a knife
- (often with down or back) to reduce, diminish or trim gradually something as if by cutting off
- To trim the hoof of a horse
- A fragment or shaving that has been pared.
- The cutting off of the surface of grassland for tillage.