Doctor wearing uniform interrupted by two Americans, each providing basin (8,4)

'basin' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'doctor wearing uniform interrupted by two americans each' is the wordplay.
I cannot quite understand how this works, but
'doctor' could be 'ear' (ear doctor is a kind of doctor) and 'ear' is found in the answer.
'wearing' could be 'in' (you are 'in' the clothes you're wearing) and 'in' is found within the answer.
'americans' could be 'aa' (two abbreviations for American) and 'aa' is found in the remaining letters.
'each' could be 'ea' (abbreviation) and 'ea' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'providing' is the link.

Can you help me to learn more?