The most common and most likely answer to this crossword clue is the 7 letter word RACIEST
I've seen this crossword clue in The Daily Telegraph
R
A
C
I
E
S
T
Buddy explains!
The straight part
We know that "most saucy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most saucy = raciest.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 RACIEST mean?
RACIEST adjective- Mildly risqué.
- Having a strong flavor indicating origin; of distinct characteristic taste; tasting of the soil.
- (by extension) Exciting to the mind by a strong or distinctive character of thought or language; peculiar and piquant; fresh and lively.
- Involving a data race or a race condition.