The most common and most likely answer to this crossword clue is the 7 letter word HOCKING
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Buddy explains!

The straight part
We know that "Pawning" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pawning = hocking.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 HOCKING mean?
HOCKING verb- To disable by cutting the tendons of the hock; to hamstring; to hough.
- To leave with a pawnbroker as security for a loan.
- To bother; to pester; to annoy incessantly