Roses developing inflammations (5)
I believe the answer is:
sores
'inflammations' is the definition.
'roses developing' is the wordplay.
'developing' indicates an anagram.
'roses' with letters rearranged gives 'SORES'.
(Other definitions for sores that I've seen before include "Skin infections" , "Lesions" , "Diseased spots" , "Painful spots on roses" .)