Ring about this aggressive approach to stock management? (9)
I believe the answer is:
bullfight
This clue could be a double definition.
'ring' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'this aggressive approach to stock management?' is the second definition.
The definition suggests a singular noun which matches the answer.
'about' is the link.
(Other definitions for bullfight that I've seen before include "Example of Spanish blood sport" , "may enthrall the Spanish" , "Taurine-based conflict as entertainment in Spain" , "Spanish entertainment" , "Spanish spectacle" .)