Drop an order to forgive (6)
I believe the answer is:
pardon
'forgive' is the definition.
(I know that pardon is a more specific form of the action forgive)
'drop an order' is the wordplay.
'order' indicates an anagram.
'drop'+'an'='dropan'
'dropan' is an anagram of 'PARDON'.
'to' acts as a link.
(Other definitions for pardon that I've seen before include "Forgive the polite interruption" , "Forgive; come again?" , "Excuse or absolve" , "Allow to go unpunished" , "indulgence" .)