Change working time (5)
I believe the answer is:
shift
This clue could be a double definition.
'change working' is the first definition.
'shift' can be an answer for 'change' (synonyms). I'm unsure of the 'working' bit.
'time' is the second definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for shift that I've seen before include "Move (fast!)" , "underskirt" , "Switch" , "Simple dress; spell of work" , "Move; loose dress" .)