Jog to the north to protect soldiers in anguish (7)
I believe the answer is:
torment
'anguish' is the definition.
(tormenting is a kind of anguishing)
'jog to the north to protect soldiers' is the wordplay.
'jog' becomes 'trot' (synonyms).
'to the north' says the letters should be written in reverse (in a down clue, letters go up or 'northward').
'to protect' is an insertion indicator (inserted letters are held or protected).
'soldiers' becomes 'men' (men can mean a group of soldiers).
'trot' in reverse letter order is 'tort'.
'tort' enclosing 'men' is 'TORMENT'.
'in' acts as a link.
(Other definitions for torment that I've seen before include "Agony of mind" , "Great agony" , "Badger" , "Harass" , "Extreme mental or physical distress" .)