Mine (8)
'mine' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for dig that I've seen before include "Loosen or turn up earth" , "Maybe break new ground" , "what archaeologists do" , "Burrow" , "Go into" .)
'mine' is the definition.
(down the pit)
This is the entire clue.
(Other definitions for pit that I've seen before include "Match (one's wits); mine" , "A hole as for coal" , "Large hole; mine" , "Tip into hole" , "Cavity" .)
'mine' is the definition.
(a colliery is a coal mine)
This is the entire clue.
(Other definitions for colliery that I've seen before include "Pit" , "Mining complex" , "Coal mine" , "Coal-mining establishment" , "Coalmine and surrounding buildings" .)
(Another definition for dibs that I've seen is " Money (sl.)".)