Unscramble lyric after a month (6)
I believe the answer is:
decode
'unscramble' is the definition.
(I've seen this before)
'lyric after a month' is the wordplay.
'lyric' becomes 'ode' (ode is a kind of lyric).
'after' is a charade indicator (letters next to each other).
'a month' becomes 'dec' (Dec is an example).
'ode' put after 'dec' is 'DECODE'.
(Other definitions for decode that I've seen before include "Decipher, decrypt" , "Explain" , "Convert a message into ordinary language" , "Interpret" , "Penetrate or solve encrypted message" .)