Dutch capital and part of London doing business (7)
I believe the answer is:
dealing
'doing business' is the definition.
(thesaurus)
'dutch capital and part of london' is the wordplay.
'dutch capital' becomes 'd' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' says to put letters next to each other.
'part of london' becomes 'ealing' (I've seen this before).
'd'+'ealing'='DEALING'
Can you help me to learn more?
(Other definitions for dealing that I've seen before include "Coping" , "Distributing (cards)" , "Making trades (with cards?)" , "Trading" , "Giving out cards" .)