Alarm concerning being in the wrong (5)
I believe the answer is:
siren
'alarm' is the definition.
(siren is a kind of alarm)
'concerning being in the wrong' is the wordplay.
'concerning' becomes 're'.
'being in the' means one lot of letters goes inside another.
'wrong' becomes 'sin' (I've seen this before**).
're' inserted into 'sin' is 'SIREN'.
(Other definitions for siren that I've seen before include "Alarm - fascinating woman" , "Vamp; alarm" , "Temptress - makes a loud noise!" , "Alluring female" , "Loud whistle or kind of witch" .)