Discovering capital in London and making money (8)
I believe the answer is:
learning
'discovering' is the definition.
('learn' can be a synonym of 'discover')
'capital in london and making money' is the wordplay.
'capital in' indicates taking the first letters.
'and' says to put letters next to each other.
'making money' becomes 'earning' (I've seen this before).
The first letter of 'london' is 'l'.
'l'+'earning'='LEARNING'
(Other definitions for learning that I've seen before include "The gaining of knowledge" , "Lore" , "Researching - scholarship" , "Cognitive process of acquiring skill or knowledge" , "Erudition - education" .)