Both ends of palace fixed with American's money (6)
I believe the answer is:
peseta
'money' is the definition.
(I've seen this before)
'both ends of palace fixed with american's' is the wordplay.
'both ends of' suggests removing the centre (only the letters at each end of the word).
'fixed' becomes 'set' (both can mean decided or determined).
'with' is a charade indicator (letters next to each other).
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'palace' with its centre removed is 'pe'.
'pe'+'set'+'a'='PESETA'
(Other definitions for peseta that I've seen before include "Out of date bread" , "Spanish bread once" , "Formerly, unit of Spanish money" , "Old bit" , "Former Spanish currency unit" .)