Discharge — absolve (3,3)
I believe the answer is:
let off
This clue is a double definition.
'discharge' is the first definition.
(I've seen this before)
'absolve' is the second definition.
(letting off is a kind of absolving)
(Other definitions for let off that I've seen before include "Discharge (a firework)" , "Set free without charge" , "Refrain from punishing, or ignite a firework" , "impose no punishment at all?" , "Pardon - discharge" .)