Abolish America's donut, flatly (7)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
annulus
'donut flatly' is the definition.
I can't tell whether this definition defines the answer.
'abolish america's' is the wordplay.
'abolish' becomes 'annul' (I've seen this before).
'america's' becomes 'US'' ('US' can be a synonym of 'america').
'annul'+'us'='ANNULUS'
Can you help me to learn more?
(Other definitions for annulus that I've seen before include "Ring-shaped object" , "Ring-shaped structure" .)