Arrogant about grand piano at the front (12)
I believe the answer is:
presumptuous
'arrogant' is the definition.
(thesaurus)
'about grand piano at the front' is the wordplay.
I cannot quite understand how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is located in the answer.
'grand' could be 'sumptuous' (I've seen this before) and 'sumptuous' is located in the answer.
'piano' could be 'p' (musical abbreviation) and 'p' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for presumptuous that I've seen before include "Impertinent" , "Assuming too much" , "Bold - forward" , "Impertinently bold" .)