Old American in Tennessee that may be full of beans (3,3)
I believe the answer is:
tin can
'that may be full of beans' is the definition.
(can of beans)
'old american in tennessee' is the wordplay.
'old american' becomes 'Inca' (the Inca were a South American people).
'in' indicates putting letters inside.
'tennessee' becomes 'TN' (abbreviation).
'inca' going into 'tn' is 'TIN-CAN'.
(Other definitions for tin can that I've seen before include "container - this one?" , "Means to preserve" , "Metal container" , "Container for baked beans, for example" , "emptied food container" .)