Cryptic crossword clue
Boris’s wife, we hear, presuming to move to next position 5,7

The most common and most likely answer to this crossword clue is the 5 plus 7 letter word CARRY FORWARD

I've seen this crossword clue in The Guardian
C
A
R
R
Y
F
O
R
W
A
R
D

Buddy explains!

The straight part
We know that "move to next position" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case move to next position = carry forward.
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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