Offenders shot into ship (7)
I believe the answer is:
sinners
'offenders' is the definition.
(sinner is a kind of offender)
'shot into ship' is the wordplay.
'shot' becomes 'inner' (I've seen this before).
'into' indicates putting letters inside.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'inner' put into 'ss' is 'SINNERS'.
(Other definitions for sinners that I've seen before include "Transgressors of divine law" , "criminals" .)