One sharing job perhaps is to leave with watch (4-5)
I believe the answer is:
part-timer
'one sharing job perhaps is' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'leave with watch' is the wordplay.
'leave' becomes 'part' (parting means leaving or separating).
'with' says to put letters next to each other.
'watch' becomes 'timer' (a watch might be used to time something).
'part'+'timer'='PART-TIMER'
'to' is the link.
Can you help me to learn more?
(Other definitions for part-timer that I've seen before include "One working less than a full week" , "One working reduced hours" , "One not working the whole week" , "worker on reduced hours" , "Casual worker" .)