Half the cotton weighs a lot (3)

I believe the answer is:

ton

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

'lot' is the definition.
(I've seen this in another clue)

'half the cotton weighs a' is the wordplay.
'TON' is hidden within the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ton that I've seen before include "1000 kilos" , "High-speed" , "2240lbs" , "20 cwt" , "A slang 100 mph" .)

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.