Dandies have some currency in America (5)
I believe the answer is:
bucks
'dandies' is the definition.
(I've seen this before)
'some currency in america' is the wordplay.
'some currency' becomes 'buck' (buck is a kind of currency).
'in america' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'buck'+'s'='BUCKS'
'have' is the link.
Can you help me to learn more?
(Other definitions for bucks that I've seen before include "English county (abbr) - deer" , "Male rabbits" , "County to northwest of London (abbrev.)" , "Goes against" , "overseas money" .)