Cryptic crossword clue
Eric’s mate knocked back roll, holding onto key that belongs to car? 10

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

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Buddy explains!

The straight part
We know that "that belongs to car?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that belongs to car? = alternator.
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 ALTERNATOR mean?

ALTERNATOR noun
  1. An electric generator which produces alternating current through mechanical means.

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