clean someone's clock vs defeat

clean someone's clock

• To defeat someone decisively, in a physical fight or other competition or negotiation. 

defeat

• To overcome in battle or contest. 

• To nullify 

• To prevent (something) from being achieved. 

• To reduce, to nothing, the strength of. 

• The act or instance of being defeated, of being overcome or vanquished; a loss. 

• Frustration (by prevention of success), stymieing; (law) nullification. 

• The act or instance of defeating, of overcoming, vanquishing.