One making the cut? (6)
'the cut?' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for knife that I've seen before include "Cutlery item" , "following Stanley perhaps" , "Cutting instrument" , "Carver" , "Cutting tool" .)
(Other definitions for barber that I've seen before include "one to profit from the cuts?" , "American composer; hairdresser" , "Sweeney Todd's profession in Fleet Street" , "Hairdresser who also shaves beards" , "Men's hairdresser, musically of Seville" .)