Notice call to work (5-2)
I believe the answer is:
heave-ho
I believe this clue is a double definition.
'notice' is the first definition.
(I've seen this before)
'call to work' is the second definition.
(I've seen this before)
(Other definitions for heave-ho that I've seen before include "Sailors' cry when pulling on a rope" , "Cry to aid physical effort" , "Dismissal (informal)" , "Cry accompanying physical effort" , "The push" .)