The Seven Dwarfs' workplace (4)
I believe the answer is:
mine
'the seven dwarfs' workplace' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mine that I've seen before include "Pit; source" , "Pit; explosive device" , "Bomb - colliery" , "Donnybrook" , "Coalpit" .)