"Help!” victim called out (7)
I believe the answer is:
succour
'help' is the definition.
(I know that succour is a type of help)
'victim called out' is the wordplay.
'victim' becomes 'sucker' (sucker is a kind of victim).
'called out' indicates a 'sounds like' (homophone) clue.
'sucker' is a homophone of 'SUCCOUR'.
(Other definitions for succour that I've seen before include "Render assistance to" , "Relief in time of distress" , "Comfort" , "Isolated" , "Assistance, support" .)