The most common and most likely answer to this crossword clue is the 11 plus 5 letter word SIGNIFICANT OTHER
I've seen this crossword clue in The Guardian
S
I
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N
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F
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C
A
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More clues leading to the result SIGNIFICANT OTHER
Buddy explains!
The straight part
We know that "Mrs Vlad?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mrs vlad? = significant other.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.