Altering so as not to involve fractions (8)

I believe the answer is:

integral

I'm a little stuck... Click here to teach me more about this clue!

'as not to involve fractions' is the definition.
I can't tell whether this definition defines the answer.

'altering' is the wordplay.
'altering' can be anagrammed to 'INTEGRAL'.
Though, I'm unsure how this is indicated.

'so' is the link.

Can you help me to learn more?

(Other definitions for integral that I've seen before include "form whole" , "Basic" , "Maths function; entire" , "Forming an essential part" , "though whole" .)

I've seen this clue in The Irish News.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.