Youngster gets a lot of money for piano (4,5)
I believe the answer is:
baby grand
'piano' is the definition.
(baby grand is a kind of piano)
'youngster gets a lot of money' is the wordplay.
'youngster' becomes 'baby'.
'gets' is a charade indicator (letters next to each other).
'a lot of money' becomes 'grand'.
'baby'+'grand'='BABY GRAND'
'for' is the link.
(Other definitions for baby grand that I've seen before include "Instrument" , "Small, non-upright piano" , "Infant piano?" , "Smaller piano" , "Type of piano" .)