They took over from the night shift (7)

I believe the answer is:

pyjamas

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'night shift' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
I also know that 'night' relates to this answer.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pyjamas that I've seen before include "Pays jam poorly to wear them" , "Night attire" , "Bed clothes" , "Sleeping attire" , "Nightwear" .)

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

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