One who'll have brush with poor ear doctor (9)
I believe the answer is:
decorator
'one who'll have brush' is the definition.
I can't judge whether this definition defines the answer.
'poor ear doctor' is the wordplay.
'poor' is an anagram indicator.
'ear'+'doctor'='eardoctor'
'eardoctor' with letters rearranged gives 'DECORATOR'.
'with' is the link.
Can you help me to learn more?
(Other definitions for decorator that I've seen before include "Worker embellishing a property" , "Painter, wallpaper hanger" , "House painter" , "Who paints" , "Eg, painter, wallpaperer" .)