Husband given arsenic suffers (3)
I believe the answer is:
has
'suffers' is the definition.
('have' can be a synonym of 'suffer')
'husband given arsenic' is the wordplay.
'husband' becomes 'h'.
'given' is a charade indicator (letters next to each other).
'arsenic' becomes 'As' (As is the chemical symbol for arsenic).
'h'+'as'='HAS'
(Other definitions for has that I've seen before include "Cheats" , "Possesses or owns" , "Gives birth to" , "Enjoys" , "Eats" .)