Spot drilled by American uncle, getting kind of oil (6)
I believe the answer is:
sesame
'kind of oil' is the definition.
(I've seen this in another clue)
'spot drilled by american uncle' is the wordplay.
'spot' becomes 'see' (both can mean to notice or observe).
'drilled by' indicates putting letters inside.
'american uncle' becomes 'Sam' (Uncle Sam is a nickname for the USA).
'see' going around 'sam' is 'SESAME'.
'getting' is the link.
(Other definitions for sesame that I've seen before include "Crop valued for its seeds and oil" , "Open ...... is magic phrase for opening door in pantomime" , "which magically opens" , "Part of code for opening" , "'Open . . . . . .'' is a magic phrase to gain access" .)