Arrangement of Grieg sonata at last we'd listened in on (9)
I believe the answer is:
earwigged
'listened in on' is the definition.
I can't judge whether this definition defines the answer.
'arrangement of grieg sonata at last we'd' is the wordplay.
'arrangement of' indicates an anagram.
'at last' suggests the final letters.
The last letter of 'sonata' is 'a'.
'grieg'+'a'+'wed'='griegawed'
'griegawed' is an anagram of 'EARWIGGED'.
Can you help me to learn more?
(Other definitions for earwigged that I've seen before include "Illicitly picked up" , "Overheard" , "Eavesdropped" , "Listened" .)