Cryptic crossword clue
King, nun and tot, together jumping around, loosening 10

The most common and most likely answer to this crossword clue is the 10 letter word UNKNOTTING

U
N
K
N
O
T
T
I
N
G

Buddy explains!

The straight part
We know that "loosening" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case loosening = unknotting.
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

UNKNOTTING verb
  1. To unfasten (a knot).
UNKNOTTING noun
  1. The act of untying a knot.

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