Endure work, getting call to retire (4,4)
I believe the answer is:
last post
'call to retire' is the definition.
(military call played before sleep)
'endure work getting' is the wordplay.
'endure' becomes 'last' (synonyms).
'work' becomes 'post' (post is a kind of work).
'getting' means one lot of letters go next to another.
'last'+'post'='LAST POST'
(Other definitions for last post that I've seen before include "Bedtime bugle call" , "Evening collection" , "ceremonial piece of music" , "passing notes from the military?" , "for mourning people?" .)