Puzzle initially freaking out clumsy idiot (6)

I believe the answer is:

lummox

I'm a little stuck... Click here to teach me more about this clue!

'idiot' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for lummox that I've seen before include "Ass" , "Lumbering oaf" , "Clumsy oaf" , "Gauche fool" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.