Crossword Genius

Take off last of cellophane, packaging item one’s put in post (9)

Ross

I believe the answer is:

appointee

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'take off last' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'of cellophane packaging item one's put in post' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is found within the answer.
'put' could be 'tee' (teeing is a kind of putting) and 'tee' is found in the answer.
'in' is within the answer.
'post' could be 'p' (abbreviation as in PS for postscript) and 'p' is located in the answer.
'one' could be 'a' (a thing is one thing) and 'a' is located in the answer.
A single letter 'p' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for appointee that I've seen before include "Successful applicant" , "Chap getting post" , "has been given a role" , "One assigned to a job or role" , "One assigned to a post" .)

I've seen this clue in The Guardian.
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