Choose tool (4)
I believe the answer is:
pick
I believe this is a double definition.
'choose' is the first definition.
(I know that pick is a more specific form of the action choose)
'tool' is the second definition.
(pick is a kind of tool)
(Other definitions for pick that I've seen before include "Choose - tool for breaking up ground" , "tool for breaking rocks" , "The best tool" , "tool - it breaks" , "Hero of a Dickens novel" .)