Muslim nurse is upset about America (7)
I believe the answer is:
senussi
'muslim' is the definition.
(the Senussi are a Muslim group)
'nurse is upset about america' is the wordplay.
I cannot really understand how this works, but
'nurse' could be 'sen' (I've seen this in other clues) and 'sen' is found within the answer.
'america' could be 'us' (United States) and 'us' is found in the answer.
The remaining letters 'si' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for senussi that I've seen before include "Muslim sectarian" , "African Muslim sect" .)