Young man suppressing yen to be a woman (4)
I believe the answer is:
lady
'a woman' is the definition.
(I know that woman can be written as lady)
'young man suppressing yen' is the wordplay.
'young man' becomes 'lad' (lad can mean a boy or young man).
'suppressing' means one lot of letters go next to another (in a down clue, some letters go on top of others).
'yen' becomes 'y' (resembles the symbol for the currency of Japan).
'lad'+'y'='LADY'
'to be' acts as a link.
(Other definitions for lady that I've seen before include "older female" , "High-class woman" , "Gentlewoman" , "See 20" , "Lord's wife - peeress's title" .)