Cryptic crossword clue
Sailor on a steamship, incompetent fool 7

The most common and most likely answer to this crossword clue is the 7 letter word JACKASS

I've seen this crossword clue in The Daily Telegraph
J
A
C
K
A
S
S


Buddy explains!

The straight part
We know that "incompetent fool" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case incompetent fool = jackass.
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 JACKASS mean?

JACKASS noun
  1. A male donkey
  2. A foolish or stupid person
  3. An inappropriately rude or obnoxious person
JACKASS verb
  1. To behave very obnoxiously
JACKASS proper noun
  1. A jack and an ace as a starting hand in Texas hold 'em due to phonetic similarity

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