Get even with Reg, perhaps? (7)
I believe the answer is:
revenge
'get' is the definition.
(I know that get is a more specific form of the action get back)
'even with reg perhaps?' is the wordplay.
'with' is a charade indicator (letters next to each other).
'perhaps?' indicates anagramming the letters (I've seen 'perhaps' mean this).
'even' put after 'reg' is 'regeven'.
'regeven' with letters rearranged gives 'REVENGE'.
(Other definitions for revenge that I've seen before include "Ship remembered in verse" , "Retribution" , "Satisfaction taken for injury" , "Malicious retaliation" , "An eye for an eye" .)