A winger, but you wouldnt believe it by its sound! (8)
I believe the answer is:
lyrebird
'it by its sound' is the definition.
The definition suggests a singular noun which matches the answer.
'a winger but you wouldnt believe' is the wordplay.
I cannot really see how this works, but
'winger' could be 'bird' and 'bird' is present in the answer.
The remaining letters 'lyre' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for lyrebird that I've seen before include "Australian native" , "Australian long-tailed avian" , "Very long-tailed flier" , "mimic" , "Australian pheasant" .)