Cryptic crossword clue
Dealt with chum needing to collect a vehicle — something in hand 10

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

I've seen this crossword clue in The Guardian
M
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Buddy explains!

The straight part
We know that "something in hand" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case something in hand = metacarpal.
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 METACARPAL mean?

METACARPAL noun
  1. Any of the bones of the metacarpus.
METACARPAL adjective
  1. Of the metacarpus.

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