Single rod shattered by strong tool (9,4)
I believe the answer is:
soldering iron
'tool' is the definition.
(soldering iron is a kind of tool)
'single rod shattered by strong' is the wordplay.
'shattered' indicates anagramming the letters.
'by' says to put letters next to each other.
'strong' becomes 'iron' (iron can mean strong or powerful).
'single'+'rod'='singlerod'
'singlerod' with letters rearranged gives 'soldering'.
'soldering'+'iron'='SOLDERING-IRON'
(Other definitions for soldering iron that I've seen before include "Tool for making electrical joints" , "Circuit builder's tool" .)