Husband is horrible for health (5,4)
I believe the answer is:
other half
'husband' is the definition.
(thesaurus)
'horrible for health' is the wordplay.
'horrible' indicates anagramming the letters.
'for'+'health'='forhealth'
'forhealth' anagrammed gives 'OTHER HALF'.
'is' is the link.
(Other definitions for other half that I've seen before include "Dutch" , "partner" , "people better off than us?" , "Wife or hubby" , "Spouse" .)