Reportedly catch a disease (7)
I believe the answer is:
cholera
'disease' is the definition.
(cholera is a kind of health problem)
'reportedly catch a' is the wordplay.
'reportedly' shows a homophone (sound like).
'catch' becomes 'collar' (synonyms).
'collar' is a homophone of 'choler'.
'choler'+'a'='CHOLERA'
(Other definitions for cholera that I've seen before include "Solemn promise" , "Disease contracted from infected water" , "Oh, Clare has highly infectious disease" , "Disease caught from contaminated water" , "Deadly, infectious disease" .)