Poor chap sounds about to be sick (6)
I believe the answer is:
wretch
'poor chap' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'sounds about to be sick' is the wordplay.
'sounds about' becomes 'w' (I can't explain this - if you can you should give a lot more credence to this answer).
'to be sick' becomes 'retch' (synonyms).
'w'+'retch'='WRETCH'
Can you help me to learn more?
(Other definitions for wretch that I've seen before include "Good-for-nothing" , "Someone you feel sorry for" , "Contemptible person" , "Scoundrel" , "Unfortunate chap" .)