The ultimate salt shaker (4)

I believe the answer is:

last

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

'the ultimate' is the definition.
(I've seen this before)

'salt shaker' is the wordplay.
'salt' can be anagrammed to 'LAST'.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for last that I've seen before include "Continue" , "It helps cobbler" , "Final; keep going" , "model of repair" , "part of Oxford's restoration with this?" .)

I've seen this clue in The Globe and Mail.

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