Fire -- or reprieve? (3,3)
I believe the answer is:
let off
This clue is a double definition.
'fire' is the first definition.
(thesaurus)
'reprieve?' is the second definition.
(thesaurus)
'or' is the link.
(Other definitions for let off that I've seen before include "Allow to escape punishment" , "Go easy on" , "Excuse or release of" , "Pardon - discharge" , "Detonate" .)