Run back to find people trapped in agony (7)
I believe the answer is:
torment
'agony' is the definition.
(I know that agony can be written as torment)
'run back to find people trapped' is the wordplay.
'run back' says the letters should be written in reverse (I've seen 'running back' mean this).
'to find' becomes 'trot' (I can't justify this - if you can you should believe this answer much more).
'people' becomes 'men' (men are people).
'trapped' is an insertion indicator.
'trot' back-to-front is 'tort'.
'tort' placed around 'men' is 'TORMENT'.
'in' is the link.
Can you help me to learn more?
(Other definitions for torment that I've seen before include "Severe pain" , "Cause great pain to" , "Great agony" , "Extreme mental or physical distress" , "Anguish" .)