Hand parts in Fidelio 's opening to awful singer (7)
I believe the answer is:
fingers
'hand' is the definition.
(thesaurus)
'parts in fidelio 's opening to awful singer' is the wordplay.
'parts in fidelio ' becomes 'f' (I can't explain this - if you can you should give a lot more credence to this answer).
'opening' means one lot of letters goes inside another (some letters open a gap in others).
'to awful' indicates anagramming the letters.
'singer' is an anagram of 'ingers'.
'f' inserted into 'ingers' is 'FINGERS'.
Can you help me to learn more?
(Another definition for fingers that I've seen is " Digits".)