Control from now and hereinafter (4)

I believe the answer is:

rein

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

'control' is the definition.
(I know that rein is a type of control)

'now and hereinafter' is the wordplay.
'REIN' is hidden in amongst the letters.
But, I'm not sure how this is indicated.

'from' acts as a link.

Can you help me to learn more?

(Other definitions for rein that I've seen before include "kidney?" , "Horse's steering strap" , "leading article?" , "given free to experienced riders?" , "Part of a horses's harness" .)

I've seen this clue in the Sydney Morning Herald.

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.