Arrive at a certain conclusion (4,4)

I believe the answer is:

make sure

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

'arrive at a certain conclusion' is the definition.
I can't judge whether this definition defines the answer.

'arrive at a certain' is the wordplay.
'arrive at' becomes 'make' (synonyms).
'a certain' becomes 'sure' (I've seen this before).
'make'+'sure'='MAKE SURE'

Can you help me to learn more?

(Other definitions for make sure that I've seen before include "Put beyond risk" , "Confirm" , "Ascertain" , "Establish beyond doubt, be certain" , "Put beyond doubt" .)

I've seen this clue in The Globe and Mail.

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.