Name a particular period to stop work (4,2,1,3)
I believe the answer is:
call it a day
'stop work' is the definition.
(I've seen this before)
'name a particular period' is the wordplay.
'name' becomes 'call' (a name is a call-sign).
'a particular' becomes 'ita' (I can't justify this - if you can you should believe this answer much more).
'period' becomes 'day' (day is a kind of period).
'call'+'ita'+'day'='CALL IT A DAY'
'to' is the link.
Can you help me to learn more?
(Other definitions for call it a day that I've seen before include "Set the style for a 24-hour period" , "Stop work" , "Decide to stop doing something" , "Abandon work for now" , "sign off" .)