Cryptic crossword clue
“Do behave!” “Two of us are married in this threesome” parts of speech

The most common and most likely answer to this crossword clue is the 9 plus 5 letter word AUXILIARY VERBS

I've seen this crossword clue in Financial Times
A
U
X
I
L
I
A
R
Y
V
E
R
B
S

Buddy explains!

The straight part
We know that "parts of speech" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case parts of speech = auxiliary verbs.
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.

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