Urge using tons for hours to squeeze out under pressure (6)

I believe the answer is:

extort

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'squeeze out under pressure' is the definition.
'extort' can be an answer for 'squeeze' (I've seen this before). I am unsure of the 'out under pressure' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for extort that I've seen before include "Secure money by intimidation" , "Extract money with menances" , "Taken from by force or threats" , "Compel to pay" , "Using intimidation" .)

I've seen this clue in The Times.

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