Possibly last to go through the mill? (4)

I believe the answer is:

salt

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

'go through the mill?' is the definition.
I can't judge whether this definition defines the answer.

'possibly last' is the wordplay.
'possibly' is an anagram indicator.
'last' with letters rearranged gives 'SALT'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for salt that I've seen before include "Pile up" , "A defence against ice" , "Seasoned sailor" , "Mariner; sodium chloride" , "NaCl" .)

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