Condition may seem poor around edges of pitch (9)
I believe the answer is:
emphysema
'condition' is the definition.
(I know that emphysema is a condition)
'may seem poor around edges of pitch' is the wordplay.
'poor' indicates an anagram.
'around' means one lot of letters goes inside another.
'edges of' says to hollow out the word (remove centre letters).
'pitch' with its middle taken out is 'ph'.
'may'+'seem'='mayseem'
'mayseem' with letters rearranged gives 'emysema'.
'emysema' going around 'ph' is 'EMPHYSEMA'.
(Other definitions for emphysema that I've seen before include "Respiratory disease" , "Lung condition causes bad ESP mayhem" , "Distressing lung disease causing breathlessness" , "Lung problem causing breathlessness" , "Serious lung condition" .)