Pit, colliery (4)

I believe the answer is:

mine

This clue is a double definition.

'pit' is the first definition.
(mining pit)

'colliery' is the second definition.
(a colliery is a coal mine)

(Other definitions for mine that I've seen before include "Pit; explosive device" , "Bomb - colliery" , "Donnybrook" , "Dig for minerals like coal" , "I made?" .)

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.