The most common and most likely answer to this crossword clue is the 11 letter word BEACHCOMBER
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More clues leading to the result BEACHCOMBER
Buddy explains!

The straight part
We know that "Mr Morton" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mr morton = beachcomber.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 BEACHCOMBER mean?
BEACHCOMBER noun- A seaman who is not prepared to work but hangs around port areas living off the charity of others.
- Any loafer around a waterfront.
- A person who collects marine salvage at the coast.
- A long rolling wave of the sea.