Start aspiring to build up capital (5)
I believe the answer is:
paris
'capital' is the definition.
(capital of France)
'start aspiring to build up' is the wordplay.
I cannot really understand how this works, but
'up' could be 'is' (I've seen this in other clues) and 'is' is found within the answer.
The remaining letters 'par' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for paris that I've seen before include "An American in - -" , "where plaster comes from?" , "Trojan prince who abducted Helen" , "investment resulted from his action" , "European capital -- Trojan prince" .)