The most common and most likely answer to this crossword clue is the 6 letter word STUPID
I've seen this crossword clue in The Guardian
S
T
U
P
I
D
More clues leading to the result STUPID
- Dim boss recruits gumshoe
- Very good to interrupt boss — or foolish
- Slow ram in view mostly
- Boss is charged by detective for dope
- Gormless second mate with basic urges
- Crazy lays on the rise over one day
- Dull sanctimonious talk boring sexually active man
- Thick sauce and pieces of meat, but no starter served up
- Dopey puts up papers
- Little boy gripping male with a fleece that’s thick
Buddy explains!

The straight part
We know that "Gormless" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gormless = stupid.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 STUPID mean?
STUPID noun- A stupid person; a fool.
- The state or condition of being stupid.
- Lacking in intelligence or exhibiting the quality of having been done by someone lacking in intelligence.
- To the point of stupor.
- Characterized by or in a state of stupor; paralysed.
- Lacking sensation; inanimate; destitute of consciousness; insensate.
- Dulled in feeling or sensation; torpid
- Amazing.
- Darn, annoying.
- Extremely.