The most common and most likely answer to this crossword clue is the 7 letter word WRECKED
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More clues leading to the result WRECKED
Buddy explains!

The straight part
We know that "Mortal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mortal = wrecked.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 WRECKED mean?
WRECKED verb- To destroy violently; to cause severe damage to something, to a point where it no longer works, or is useless.
- To ruin or dilapidate.
- To dismantle wrecked vehicles or other objects, to reclaim any useful parts.
- To involve in a wreck; hence, to cause to suffer ruin; to balk of success, and bring disaster on.
- Destroyed, usually in an accident; damaged to the point of unusability.
- Very intoxicated from alcohol and/or other drugs.
- Having been put in a dreadful or embarrassing situation; can range from being pwned in a game to being utterly defeated in an argument or publicly shamed with a stinging insult.