Clue: Notice call to work (5-2)
Answer: HEAVE-HO
Explanation: Definition: Notice,call to work
 Double defn: 1st: …/a dismissal from, say, employment, as in "he was given the heave-ho after his major screw-up"; and 2nd: An expression calling for exertion/a call to work, as when sailors are manually raising an anchor.