Digital component that may be cracked? (7)
I believe the answer is:
knuckle
'digital component' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for knuckle that I've seen before include "Part of the finger" , "Hand joint" , "Bunch of fives" , "Pork joint from the knee downwards" , "Joint (of veal or pork?)" .)