Make laws that ensure supporter is dead (9)

I believe the answer is:

legislate

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'make laws that ensure' is the definition.
'legislate' can be an answer for 'make laws' (I've seen this before). I'm not sure about the remainder of the definition.

'supporter is dead' is the wordplay.
'supporter' becomes 'leg' (eg support for a table).
'dead' becomes 'late' (similar in meaning).
'leg'+'is'+'late'='LEGISLATE'

Can you help me to learn more?

(Other definitions for legislate that I've seen before include "Make rules" , "Make a ruling" , "discharge parliamentary business" , "put in force" , "For what governments do" .)

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

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