Do away with boil as treated by hospital (7)
I believe the answer is:
abolish
'do away with' is the definition.
(I've seen this before)
'boil as treated by hospital' is the wordplay.
'treated' indicates an anagram.
'by' is a charade indicator (letters next to each other).
'hospital' becomes 'h' (abbreviation for hospital on maps).
'boil'+'as'='boilas'
'boilas' anagrammed gives 'abolis'.
'abolis'+'h'='ABOLISH'
(Other definitions for abolish that I've seen before include "Scrap" , "delete" , "Put an end to, formally" , "Annul - eradicate" , "Nullify" .)