A bloke hoarding millions in the capital (5)
I believe the answer is:
amman
'capital' is the definition.
(Amman is an example)
'a bloke hoarding millions' is the wordplay.
'bloke' becomes 'man' (I've seen this in other clues).
'hoarding' means one lot of letters goes inside another.
'millions' becomes 'm' (abbreviation).
'man' going around 'm' is 'mman'.
'a'+'mman'='AMMAN'
'in the' acts as a link.
(Other definitions for amman that I've seen before include "A capital f-fellow in Jordan?" , "Middle East capital" , "Jordanian capital" , "Jordanian city" , "Jordan's capital" .)