Crossword Genius

Makes certain to blame son if cocaine goes missing (7)

Ross

I believe the answer is:

ensures

'makes certain' is the definition.
('ensure' can be a synonym of 'make certain')

I can't explain the rest of the clue.

(Other definitions for ensures that I've seen before include "Makes safe or certain" , "Warrant" , "guarantees" .)

I've seen this clue in The Guardian.
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