The most common and most likely answer to this crossword clue is the 7 letter word TEMPTED
I've seen this crossword clue in The Guardian
T
E
M
P
T
E
D
More clues leading to the result TEMPTED
Buddy explains!
The straight part
We know that "with his mouth watering" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with his mouth watering = tempted.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 TEMPTED mean?
TEMPTED verb- To provoke someone to do wrong, especially by promising a reward; to entice.
- To attract; to allure.
- To provoke something; to court.