Throw with effort (5)
I believe the answer is:
heave
'throw with effort' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for heave that I've seen before include "Struggle to move" , "past Hove" , "Produce (a sigh); lift" , "Pull hard; (sea) swell" , "Lift or haul with great effort" .)