The most common and most likely answer to this crossword clue is the 6 letter word CARNAL
C
A
R
N
A
L
More clues leading to the result CARNAL
- Heartless priest dealing with Biblical knowledge
- Lascivious, heartless church bigwig
- Lewd about sailors half-stripped!
- Sexual relationship beginning in Venetian thoroughfare?
- Sexual abuser finally arrested in the tube
- Erotic passage involving Romeo
- Sensual dipper’s bottom visible in waterway
- Physical resistance found in Tube
- Erotic passage containing start of rumpy-pumpy
- Sensual festive occasion with four passing out
Buddy explains!

The straight part
We know that "lustful" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lustful = carnal.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 CARNAL mean?
CARNAL adjective- Relating to the physical and especially sexual appetites.
- Worldly or earthly; temporal.
- Of or relating to the body or flesh.