Screen role not originally included is recast (9)

I believe the answer is:

partition

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

'role not originally included is recast' is the wordplay.
'role' becomes 'parti' (I can't explain this - if you can you should give a lot more credence to this answer).
'originally' indicates taking the first letters.
'is recast' indicates anagramming the letters.
The initial letter of 'included' is 'i'.
'not'+'i'='noti'
'noti' anagrammed gives 'tion'.
'parti'+'tion'='PARTITION'

Can you help me to learn more?

(Other definitions for partition that I've seen before include "Barrier" , "Separation (of a country) into separate nations" , "wall" , "Divide; divider" , "segregation" .)

I've seen this clue in The Independent.

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