Suffering over? That's welcome (5)
I believe the answer is:
hello
'welcome' is the definition.
(both are greetings)
'suffering over?' is the wordplay.
'suffering' becomes 'hell' (hell can mean a terrible ordeal).
'over?' becomes 'o' (cricket abbreviation).
'hell'+'o'='HELLO'
'that's' is the link.
(Other definitions for hello that I've seen before include "Routine response to telephone call" , "royals dominate its pages?" , "Hi, howdy" , "I say" , "Conversation starter" .)