Cryptic crossword clue
Insensitive to delay in hearing being heavy burden 10

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

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

The straight part
We know that "heavy burden" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case heavy burden = deadweight.
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 DEADWEIGHT mean?

DEADWEIGHT noun
  1. Unremitting heavy weight that does not move.
  2. The largest weight of cargo a ship is able to carry; i.e, the weight of a ship when fully loaded minus its weight when empty.
  3. Dead load.
  4. That which is useless or excess; that which slows something down.

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