Crossword Genius

Yakka, metaphorically (5,6)

Ross

I believe the answer is:

elbow grease

(Other definitions for elbow grease that I've seen before include "Hard rubbing (colloq.)" , "Hard physical effort" , "Vigorous physical effort" , "Vigorous physical labour involving hard rubbing" , "Hard physical work (informal)" .)

I've seen this clue in the Sydney Morning Herald.
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