Silly list; mime it for when they must be accomplished (4,6)

I believe the answer is:

time limits

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'when they must be accomplished' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'silly list mime it' is the wordplay.
'silly' indicates an anagram.
'list'+'mime'+'it'='listmimeit'
'listmimeit' with letters rearranged gives 'TIME-LIMITS'.

'for' acts as a link.

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

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