The most common and most likely answer to this crossword clue is the 7 letter word EXTINCT
I've seen this crossword clue in The Times
E
X
T
I
N
C
T
More clues leading to the result EXTINCT
- Inactive case's ending, Times having time in court
- Old lover with money, oddly cute and gone for ever
- Put out no tips for messaging court
- Former money court — vanished
- Previous partner taking time in court that's obsolete
- Former carnivore initially put in the shade, dead and gone
- Variable element in religious group missing leader no longer around
- Court pursues former lover over money that’s gone forever
- One-time Tory leader in court vanished
- No longer around, former partner can go to court
Buddy explains!

The straight part
We know that "dead and gone" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dead and gone = extinct.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 EXTINCT mean?
EXTINCT verb- To make extinct; to extinguish or annihilate.
- Extinguished, no longer alight (of fire, candles etc.)
- No longer used; obsolete, discontinued.
- (of a group of organisms, as a species) No longer in existence; having died out.
- No longer active.