Put down what sounds right (5)
I believe the answer is:
write
'put down' is the definition.
(I've seen this in another clue)
'what sounds right' is the wordplay.
'what' becomes 'w' (this could be a standard abbreviation which I don't know about).
'sounds' indicates a 'sounds like' (homophone) clue.
'right' is a homophone of 'rite'.
'w'+'rite'='WRITE'
Can you help me to learn more?
(Other definitions for write that I've seen before include "Draft" , "Compose (music)" , "Put down in black and white" , "Inscribe" , "Jot" .)