Make up (for) (5)
'make up for' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for atone that I've seen before include "Recompense" , "Make reparation for a misdeed" , "Adopt a cause" , "remedy" , "Make amends, being at one" .)
'make up for' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for recoup that I've seen before include "Make good a loss" , "Indemnify" , "Regain (expenditure)" , "Get back again, say losses (6)" , "Regain, make good" .)