Outlines scene on border at start of act (8)

I believe the answer is:

schemata

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'outlines' is the definition.
('schema' can be a synonym of 'outline')

'scene on border at start of act' is the wordplay.
'scene' becomes 'sc' (theatrical abbreviation).
'on border' becomes 'hem' (I've seen this before. I am not sure about the 'on' bit.**).
'start of' indicates taking the first letters.
The first letter of 'act' is 'a'.
'sc'+'hem'+'at'+'a'='SCHEMATA'

Can you help me to learn more?

(Other definitions for schemata that I've seen before include "diagrams" , "Plans" , "Diagrammatic outlines" .)

I've seen this clue in The Independent.

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