Wanting the other currency to be supported by yen (5)
I believe the answer is:
randy
'wanting the other' is the definition.
I can't judge whether this definition defines the answer.
'currency to be supported by yen' is the wordplay.
'currency' becomes 'rand' (I've seen this before).
'to be supported by' is a charade indicator (letters next to each other) (in a down clue, some letters hold up others).
'yen' becomes 'y' (resembles the symbol for the currency of Japan).
'rand'+'y'='RANDY'
Can you help me to learn more?
(Other definitions for randy that I've seen before include "Eager to get into bed" , "boisterous locally" , "Lustful" , "Hot" .)