Free trade: put your foot down (5)

I believe the answer is:

tread

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

'foot down' is the definition.
'tread' can be an answer for 'foot' (treading is a kind of footing). I'm unsure of the 'down' bit.

'free trade put your' is the wordplay.
'trade' can be anagrammed to 'TREAD'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for tread that I've seen before include "Staircase component" , "Surface of car tyre" , "Trample" , "Sole of a shoe" , "Walk; part of tyre" .)

I've seen this clue in The Sun.

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.