The most common and most likely answer to this crossword clue is the 3 plus 4 letter word PEN NAME
I've seen this crossword clue in Financial Times
P
E
N
N
A
M
E
More clues leading to the result PEN NAME
Buddy explains!
The straight part
We know that "could be Slormgorm?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case could be slormgorm? = pen name.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 PEN NAME mean?
PEN NAME noun- A fictitious name used by an author in place of their actual name; a writer's pseudonym.