Initially pleased that group holds unknown amount of capital (9)
I believe the answer is:
pyongyang
'capital' is the definition.
(capital of North Korea)
'initially pleased that group holds unknown amount' is the wordplay.
'initially' indicates taking the first letters.
'that' becomes 'yon' (archaic term meaning 'that').
'group' becomes 'gang' (a gang is a group of people).
'holds' indicates putting letters inside.
'unknown amount' becomes 'y' (algebra).
The first letter of 'pleased' is 'p'.
'gang' enclosing 'y' is 'gyang'.
'p'+'yon'+'gyang'='PYONGYANG'
'of' acts as a link.
(Other definitions for pyongyang that I've seen before include "North Korean capital" , "Capital of North Korea" .)