Different key before bland coda (7)
I believe the answer is:
altered
'different' is the definition.
(I've seen this before)
'key before bland coda' is the wordplay.
'key' becomes 'alt' (the Alt keyboard button).
'before' becomes 'ere' (poetic term).
'bland coda' becomes 'd' (I can't justify this - if you can you should give a lot more credence to this answer).
'alt'+'ere'+'d'='ALTERED'
Can you help me to learn more?
(Other definitions for altered that I've seen before include "Converted" , "Changed, modified" , "Changed, adapted" , "Metamorphosed" , "Different" .)