Watched in agony after losing wife in divorce (6)
I believe the answer is:
detach
'divorce' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for detach that I've seen before include "Separate from, remove part" , "Disengage (something) and remove it" , "Disengage, unfasten" , "Take away -- the cad (anag)" , "Break off, come away" .)