Deports crook carrying omicron at home border (8)

I believe the answer is:

doorstep

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

'border' is the definition.
The answer and definition can be both man-made objects 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 doorstep that I've seen before include "Threshold stair" , "Large slice of bread?" , "Go from house to house" , "Old song: ` `Oh Mother Kelly's ........' '" , "Try some canvassing" .)

I've seen this clue in the Sydney Morning Herald.

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.