Sure American has hidden this tool (6)
I believe the answer is:
reamer
'this tool' is the definition.
(reamer is a kind of tool)
'sure american has hidden' is the wordplay.
'hidden' says the answer is hidden in the clue.
'REAMER' can be found hidden inside 'sure american has'.
(Other definitions for reamer that I've seen before include "Tool for enlarging drilled holes" , "Tool for shaping holes" , "Dental tool" , "Boring tool" , "Tool for widening drilled holes" .)