In time, giver suffers torment (8)
I believe the answer is:
aggrieve
'torment' is the definition.
(thesaurus)
'in time giver suffers' is the wordplay.
'in' is an insertion indicator.
'time' becomes 'age' (age is a kind of time).
'suffers' is an anagram indicator.
'giver' anagrammed gives 'griev'.
'age' enclosing 'griev' is 'AGGRIEVE'.
(Other definitions for aggrieve that I've seen before include "Distress (someone)" , "Break the heart" , "Sadden" , "Hurt" , "Trouble" .)