The most common and most likely answer to this crossword clue is the 4 plus 8 letter word WOLF WHISTLES
I've seen this crossword clue in Financial Times
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More clues leading to the result WOLF WHISTLES
Buddy explains!

The straight part
We know that "crude noises" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case crude noises = wolf whistles.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 WOLF WHISTLES mean?
WOLF WHISTLES noun- A whistle, of two notes, to signify sexual interest in someone.