Young professional pup, one working in yen and euro (6)
I believe the answer is:
yuppie
'young professional' is the definition.
'yuppie' can be an answer for 'professional' (yuppie is a kind of professional). I am not certain of the 'young' bit.
'pup one working in yen and euro' is the wordplay.
'one working' indicates an anagram.
'in' is an insertion indicator.
'yen' becomes 'y' (resembles the symbol for the currency of Japan).
'and' says to put letters next to each other.
'euro' becomes 'ie' (I can't justify this - if you can you should give a lot more credence to this answer).
'pup' anagrammed gives 'upp'.
'y'+'ie'='yie'
'upp' inserted into 'yie' is 'YUPPIE'.
Can you help me to learn more?
(Other definitions for yuppie that I've seen before include "Well-paid middle-class professional with a luxurious life style" , "Young middle-class professional with a luxurious life style" , "Young city worker" , "Well-paid young city professional" , "Affluent middle-class city professional" .)