A note concerning the return of some hostages (3)
I believe the answer is:
soh
'a note' is the definition.
(a note in the do-re-mi system)
'concerning the return of some hostages' is the wordplay.
'concerning' becomes 'os' (I can't justify this - if you can you should believe this answer much more).
'the return of' shows that the letters should be reversed in order.
'some' says to take the initial letters.
The first letter of 'hostages' is 'h'.
'os' written backwards gives 'so'.
'so'+'h'='SOH'
Can you help me to learn more?
(Other definitions for soh that I've seen before include "Doh ray me fah . . ." , "It's between fah and la" , "Musical note; sounds like very good" , "It comes between fah and lah" , "5th musical note" .)