Young singer, extremely bashful, overwhelmed by elder, maybe (6)
I believe the answer is:
treble
'young singer' is the definition.
(young male singing voice)
'extremely bashful overwhelmed by elder maybe' is the wordplay.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'overwhelmed by' indicates putting letters inside (inserted letters get absorbed or overwhelmed).
'elder maybe' becomes 'tree' (I can't justify this - if you can you should believe this answer much more).
'bashful' with its middle removed is 'bl'.
'bl' put within 'tree' is 'TREBLE'.
Can you help me to learn more?
(Other definitions for treble that I've seen before include "High voice; occurring three times" , "Boy chorister" , "High-frequency (radio control knob)" , "Three times - a boy soprano" , "high frequency" .)