After end of work I quietly sleep (3)
I believe the answer is:
Here is my best explanation:
'sleep' is the definition.
('kip' can be a synonym of 'sleep')
'after end of work i quietly' is the subsidiary indication.
'after' says to put letters next to each other.
'end of' indicates one should take the final letters.
'quietly' becomes 'p' (p for piano and quiet).
The final letter of 'work' is 'k'.
'k'+'i' is 'ki'.
(Other definitions for kip that I've seen before include "Short sleep", "Sleep, nap (colloq.)", "Nap (slang)", "Sleep (sl.)", "Slumber" and "Snooze".)