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.
Crossword Answer definitions
PEN NAME noun- A fictitious name used by an author in place of their actual name; a writer's pseudonym.