The most common and most likely answer to this crossword clue is the 6 letter word CRUMMY
I've seen this crossword clue in The Guardian
C
R
U
M
M
Y
More clues leading to the result CRUMMY
- Chelsea’s first game, awful
- Bad start to card game
- Conservative’s opening game is pathetic
- City’s first game is rubbish
- First crack at card game is useless
- Very bad cold minimised with spirit — gosh!
- Poor game of cards with clubs leading
- Key game, but lousy
- Worthless sort of cow
- Inferior crown seen on headless Egyptian’s body?
Buddy explains!

The straight part
We know that "Bad" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bad = crummy.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CRUMMY mean?
CRUMMY noun- A small van, bus, or railway car used to transport loggers or other resource workers to and from the worksite.
- A cow with a crumpled horn.
- Bad; poor.
- Full of crumb or crumbs.
- Soft, like the crumb of bread; not crusty.