Single-minded obsession of woman nursing Arab (9)
I believe the answer is:
monomania
'single-minded obsession' is the definition.
'woman nursing arab' is the wordplay.
'woman' becomes 'mona' (**).
'nursing' is an insertion indicator.
'arab' becomes 'omani' (Omani is an example).
'mona' placed around 'omani' is 'MONOMANIA'.
'of' acts as a link.
(Other definitions for monomania that I've seen before include "obsessive single-mindedness" , "Single-minded passion" , "Unhealthy preoccupation with one thing" , "Obsession with one thing" .)