Balls ups stop, with care, after nurse intervenes at last (7)
I believe the answer is:
spheres
'balls' is the definition.
(balls are usually spherical)
'ups stop with care after nurse intervenes at last' is the wordplay.
'at last' suggests the final letters.
The final letters of 'ups stop with care after nurse intervenes' are 'SPHERES'.
(Other definitions for spheres that I've seen before include "Areas" , "balls" , "Globes" .)