Papers about musician, say, releasing tango for recorder (7)
I believe the answer is:
diarist
'recorder' is the definition.
(someone who records things)
'papers about musician say releasing tango' is the wordplay.
'papers about' becomes 'di' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'musician say' becomes 'artist' (musician is a kind of artist).
'releasing' is a deletion indicator.
'tango' becomes 'T' (phonetic alphabet: alpha, bravo, charlie etc.).
'artist' with 't' removed is 'arist'.
'di'+'arist'='DIARIST'
'for' acts as a link.
(Other definitions for diarist that I've seen before include "Pepys or Frank" , "One as Evelyn, Kilvert" , "Frank, say" , "Pepys, say" , "Writer" .)