Amateur only has money (4)
I believe the answer is:
euro
'money' is the definition.
(currency of the Eurozone)
'amateur only has' is the wordplay.
'has' indicates a hidden word.
'EURO' is hidden within 'amateur only'.
(Other definitions for euro that I've seen before include "Currency of Germany" , "Currency of Greece" , "Finnish currency" , "Major currency" , "The "single currency"" .)