Cryptic crossword clue
Geyser deposit consisting of sulphur to treat as landfill? 6

The most common and most likely answer to this crossword clue is the 6 letter word SINTER

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The straight part
We know that "Geyser deposit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case geyser deposit = sinter.
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 SINTER mean?

SINTER noun
  1. An alluvial sediment deposited by a mineral spring.
  2. A mass formed by sintering.
  3. A mixture of iron ore and fluxes added to a blast furnace.
SINTER verb
  1. To compact and heat a powder to form a solid mass.

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