Contrition about dots and dashes (7)
I believe the answer is:
remorse
'contrition' is the definition.
(I've seen this before)
'about dots and dashes' is the wordplay.
'about' becomes 're' (regarding).
'dots and dashes' becomes 'morse' (I can't justify this - if you can you should believe this answer much more).
're'+'morse'='REMORSE'
Can you help me to learn more?
(Other definitions for remorse that I've seen before include "Contrition for wrongdoing" , "Guilt for a wrong deed" , "Pity" , "Guilty conscience" , "A feeling of deep regret" .)