Scope or extent of limited ambition (5)
I believe the answer is:
ambit
This clue 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.
Perhaps there's a link between them I don't understand?
'of' acts as a 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" .)