Misdeeds regularly ignored in certain days in Rome (4)
I believe the answer is:
ides
'certain days in rome' is the definition.
I can't tell whether this definition defines the answer.
'misdeeds regularly ignored' is the wordplay.
'regularly ignored' means one should take alternating letters.
The alternate letters of 'misdeeds' are 'IDES'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for ides that I've seen before include "(In March) Caesar's time to beware" , "For Romans, a day" , "May 15, for example" , "15 March, say -- key date for Caesar" , "Caesar's fateful day" .)