The agony of men in the wrong (7)
I believe the answer is:
torment
'the agony' is the definition.
('torment' can be a synonym of 'agony')
'men in the wrong' is the wordplay.
'in' means one lot of letters goes inside another.
'the wrong' becomes 'tort' (legal term).
'men' inserted inside 'tort' is 'TORMENT'.
'of' acts as a link.
(Other definitions for torment that I've seen before include "Torture" , "Pester annoyingly" , "Great agony" , "Harass" , "Great suffering" .)