The most common and most likely answer to this crossword clue is the 6 letter word PADSAW
P
A
D
S
A
W
Buddy explains!
The straight part
We know that "This makes tricky incision" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this makes tricky incision = padsaw.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 PADSAW mean?
PADSAW noun- A type of narrow-bladed saw used especially for cutting curves.