Tool smearing oil on grinders (9,4)
I believe the answer is:
soldering iron
'tool' is the definition.
(soldering iron is a kind of tool)
'smearing oil on grinders' is the wordplay.
'smearing' indicates an anagram (I've seen 'smeared' mean this).
'oil'+'on'+'grinders'='oilongrinders'
'oilongrinders' with letters rearranged gives 'SOLDERING-IRON'.
(Other definitions for soldering iron that I've seen before include "Circuit builder's tool" , "Tool for making electrical joints" .)