Scope or extent of limited ambition (5)
I believe the answer is:
ambit
This might be a double definition.
'scope or extent' is the first definition.
(I've seen this before)
'limited ambition' is the second definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'of' is the link.
Can you help me to learn more?
(Other definitions for ambit that I've seen before include "Circuit, compass" , "Circumference" , "Compass, scope" , "Scope, extent, or bounds of something" , "Range - surroundings" .)