Keeping It One __, Slang for Being Totally Honest

This page is the CodyCross answer for the clue below from Working From Home, Group 1236, Puzzle 2 (Ergonomic Chair).

Question is: Keeping It One __, Slang for Being Totally Honest

and the answer is: HUNDRED

Word Meaning:

HUNDRED — A numerical value equal to 100 (10²), occurring after ninety-nine.

Definitions from Wiktionary.

Keeping it one __, slang for being totally honest — CodyCross Answer | CodyCross Solutions