Cryptic crossword clue
Batches of deliveries by coach producing labour excessively 10

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

I've seen this crossword clue in The Daily Telegraph
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Buddy explains!

The straight part
We know that "labour excessively" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case labour excessively = overstrain.
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 OVERSTRAIN mean?

OVERSTRAIN noun
  1. Excessive strain
OVERSTRAIN verb
  1. To subject to an excessive demand on strength, resources, or abilities

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