Crossword Genius

--- down, apply oneself (6)

Ross

I believe the answer is:

buckle

(Other definitions for buckle that I've seen before include "Fasten up - give way" , "Shoe or belt fastening" , "It's attached to a belt or shoe" , "(E.g. belt) fastener; crumple" , "Give way to pressure" .)

I've seen this clue in The Times.
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