Answer: spearfish

AnswerCrossword Clue
SPEARFISHDo submarine work
SPEARFISHSouth Dakota town
SPEARFISHUse a harpoon
spearfishany of several fishes of the genus Tetrapturus, resembling the sailfish but having the first dorsal fin much less developed: inhabiting all seas, but rare
spearfishany of several related fishes
spearfishto hunt for fish with a speargun
spearfishto fish underwater using a spearlike implement used manually or propelled mechanically