Cryptic crossword clue
In vacuous orgy, male smeared sun oil with menace 9

The most common and most likely answer to this crossword clue is the 9 letter word OMINOUSLY

I've seen this crossword clue in The Guardian
O
M
I
N
O
U
S
L
Y

Buddy explains!

The straight part
We know that "with menace" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with menace = ominously.
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 OMINOUSLY mean?

OMINOUSLY adverb
  1. In an ominous manner; with sinister foreboding.

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