Crossword Genius

One left in workplace after final day is all right (14)

Ross

I believe the answer is:

satisfactorily

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

'all right' is the definition.
(synonyms)

'one left in workplace after final day' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
'left' could be 'l' (common abbreviation) and 'l' is present in the answer.
'day' could be 'sat' (abbreviation for Saturday) and 'sat' is found within the answer.
This explanation may well be incorrect...

'is' is the link.

Can you help me to learn more?

(Other definitions for satisfactorily that I've seen before include "convincingly" , "to an acceptable standard" .)

I've seen this clue in The Guardian.
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