Get a divining rod (4)
I believe the answer is:
twig
I believe this is a double definition.
'get' is the first definition.
(thesaurus)
'a divining rod' is the second definition.
(I've seen this before)
(Other definitions for twig that I've seen before include "Slender woody shoot" , "Suddenly see; branchlet" , "Small piece of tree" , "Small part of a branch - suddenly understand" , "bit of stick" .)