Initially play an old song, turning it up for cleaner (4)
I believe the answer is:
soap
'cleaner' is the definition.
(soap is a kind of cleaner)
'initially play an old song turning' is the wordplay.
'initially' indicates taking the first letters.
'turning' says the letters should be written backwards.
The first letters of 'play an old song' is 'paos'.
'paos' backwards is 'SOAP'.
'it up for' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for soap that I've seen before include "Washing substance" , "Popular TV programme (which cleans?)" , "TV series of cleansing sort" , "Cleansing agent" , "Cleaner - TV programme" .)