Cryptic crossword clue
Senior officer I covered with dirt-like slimy stuff 6

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

I've seen this crossword clue in The Guardian
M
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The straight part
We know that "like slimy stuff" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like slimy stuff = mucoid.
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 MUCOID mean?

MUCOID adjective
  1. Pertaining to or resembling mucus; mucous.
MUCOID noun
  1. Any of a class of mucin-like substances yielding on decomposition a reducing carbohydrate together with some form of proteinaceous matter.

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