Make amends around lunchtime, perhaps? (5)
I believe the answer is:
atone
'make amends' is the definition.
(to atone is to make amends for a wrong deed)
'around lunchtime perhaps?' is the wordplay.
'around' becomes 'at' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'lunchtime perhaps?' becomes 'one' (I've seen this in another clue).
'at'+'one'='ATONE'
Can you help me to learn more?
(Other definitions for atone that I've seen before include "Expiate" , "Turn away from sin and do penance" , "Make up, compensate (for)" , "Make redress" , "Make good" .)