Terrible men dad cursed! (6)
I believe the answer is:
damned
'cursed' is the definition.
(synonyms)
'terrible men dad' is the wordplay.
'terrible' is an anagram indicator.
'men'+'dad'='mendad'
'mendad' with letters rearranged gives 'DAMNED'.
(Other definitions for damned that I've seen before include "Consigned to hell or perdition" , "Consigned to everlasting punishment" , "Those condemned to eternal punishment" , "Abominable" , "Mad Ned was doomed" .)