Finishing breakfast with a bad cigar is no joke! (6)
I believe the answer is:
tragic
'is no joke' is the definition.
I can't judge whether this defines the answer.
'finishing breakfast with a bad cigar' is the wordplay.
'finishing' indicates one should take the final letters (the letter which finishes the word).
'with' is a charade indicator (letters next to each other).
'a bad' is an anagram indicator.
The last letter of 'breakfast' is 't'.
'cigar' anagrammed gives 'ragic'.
't'+'ragic'='TRAGIC'
Can you help me to learn more?
(Other definitions for tragic that I've seen before include "heartbreaking" , "Resulting in great loss" , "Pitiable" , "Grievous" , "Intensely sad and distressing" .)