Mattock (7)
I believe the answer is:
pickaxe
'mattock' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for pickaxe that I've seen before include "strike-breaker?" , "Mattock" , "it's needed to break new ground" , "Wooden-handled iron tool with a curved head, pointed at both ends" , "Ground-breaking tool" .)