Get rid of boils spreading in a hospital (7)
I believe the answer is:
abolish
'get rid of' is the definition.
('abolish' can be a synonym of 'get rid of')
'boils spreading in a hospital' is the wordplay.
'spreading' indicates anagramming the letters.
'in' is an insertion indicator.
'hospital' becomes 'h'.
'boils' with letters rearranged gives 'bolis'.
'a'+'h'='ah'
'bolis' inserted within 'ah' is 'ABOLISH'.
(Other definitions for abolish that I've seen before include "Quash" , "Put an end to, cancel" , "Get rid of" , "Terminate" , "Formally do away with" .)