Bean: American tool used to chop British one (6)
I believe the answer is:
adzuki
'bean american' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'tool used to chop british one' is the wordplay.
I cannot quite understand how this works, but
'tool' could be 'adz' (adz is a kind of tool) and 'adz' is located in the answer.
'british' could be 'uk' (Great Britain) and 'uk' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for adzuki that I've seen before include "type of beans" , "Type of bean (Z, not S)" , "Bean plant" , "Small edible bean (z, not s)" .)