German composer turned up a piano part with D flat (8,3)

I believe the answer is:

bachelor pad

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'flat' is the definition.
(I've seen this before)

'german composer turned up a piano part with d' is the wordplay.
'german composer' becomes 'bachelor' (I can't explain this - if you can you should give a lot more credence to this answer).
'turned up' is a reversal indicator.
'part' indicates taking the first letters.
'with' says to put letters next to each other.
The first letter of 'piano' is 'p'.
'a'+'p'='ap'
'ap' back-to-front is 'pa'.
'bachelor'+'pa'+'d'='BACHELOR PAD'

Can you help me to learn more?

(Other definitions for bachelor pad that I've seen before include "Single person's flat" , "Single male's home" , "Flat for a single man" .)

I've seen this clue in The Telegraph.

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