Schedule extreme restrictions on project (6)

I believe the answer is:

scheme

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This clue could be a double definition.

'schedule extreme restrictions' is the first definition.
'scheme' can be an answer for 'schedule' (thesaurus). I'm not sure about the 'extreme restrictions' bit.

'project' is the second definition.
(I've seen this in another clue)

'on' acts as a link.

Can you help me to learn more?

(Other definitions for scheme that I've seen before include "System or strategy" , "proposal" , "'Plot, plan (6)'" , "Hatch - plot" , "Wheel and deal" .)

I've seen this clue in the Sydney Morning Herald.

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