Select the best tool (4)
I believe the answer is:
pick
I believe this clue is a double definition.
'select' is the first definition.
(picking is a kind of selecting)
'the best tool' is the second definition.
(I've seen this before)
(Other definitions for pick that I've seen before include "tool - it breaks" , "Selection" , "Eat very little" , "it for breaking up the soil" , "Select - implement" .)