Move period of work (5)

I believe the answer is:

shift

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This clue might be a double definition.

'move' is the first definition.
(shift is a kind of move)

'period of work' is the second definition.
'shift' can be an answer for 'period' (shift is a kind of period). I am not sure about the 'of work' bit.

Can you help me to learn more?

(Other definitions for shift that I've seen before include "Move; garment" , "Change - period of work" , "Alter" , "Change location" , "Move from one position to another" .)

I've seen this clue in The Telegraph.

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