Being flashy is no way to play piano (4)
I believe the answer is:
loud
'being flashy' is the definition.
('loud' can be a synonym of 'flashy')
'no way to play piano' is the wordplay.
I cannot quite understand how this works, but
'no' could be 'o' (resembles 0 - 'no' can mean 'zero') and 'o' is located in the answer.
The remaining letters 'lud' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Other definitions for loud that I've seen before include "Tasteless; of great volume" , "Blaring" , "Audibly, or visually, obtrusive" , "This speaker is" , "Fortissimo - gaudy" .)