The most common and most likely answer to this crossword clue is the 10 letter word TRANSITIVE
I've seen this crossword clue in The Daily Telegraph
T
R
A
N
S
I
T
I
V
E
Buddy explains!
The straight part
We know that "Sort of verb" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sort of verb = transitive.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 TRANSITIVE mean?
TRANSITIVE adjective- Making a transit or passage.
- Affected by transference of signification.
- (grammar, of a verb) Taking a direct object or objects.
- (of a relation on a set) Having the property that if an element x is related to y and y is related to z, then x is necessarily related to z.
- (of a group action) Such that, for any two elements of the acted-upon set, some group element maps the first to the second.
- (of a graph) Such that, for any two vertices there exists an automorphism which maps one to the other.