Act when some came in late (8)

I believe the answer is:

departed

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

'act when some came in' is the wordplay.
'act when' becomes 'deed' (deed is a kind of act. I am not sure about the 'when' bit.).
'some' becomes 'part' (only part of something).
'came in' is an insertion indicator.
'deed' going around 'part' is 'DEPARTED'.

Can you help me to learn more?

(Other definitions for departed that I've seen before include "Left, went away" , "Left -- late" , "Quit" , "Dead; set off" , "Went - dead" .)

I've seen this clue in The Globe and Mail.

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