Find Out for Certain, Establish Something Is True

This page is the CodyCross answer for the clue below from Airport, Group 453, Puzzle 3 (Saying Goodbye).

Question is: Find Out for Certain, Establish Something Is True

and the answer is: ASCERTAIN

Word Meaning:

ASCERTAIN — (transitive) To find out definitely; to discover or establish.

Definitions from Wiktionary.