Crossword Genius

Makes certain criticism when head's not there with son (7)

Ross

I believe the answer is:

ensures

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

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

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