The most common and most likely answer to this crossword clue is the 9 letter word WOEBEGONE
W
O
E
B
E
G
O
N
E
More clues leading to the result WOEBEGONE
- Blue net, for example, I used to catch duck
- Octopus originally caught in net close to home left with a sad expression
- Miserable? Cheer up!
- Sad-looking whore regularly ignored? Get away!
- Wretched internet with nothing in, for example on energy
- Without love, we ask person to be sad
- Unhappy women discontentedly oppose desire before lunchtime
- Beset by grief, broken, we beg no-one to lose love.
- Sorry expression for one banishing the blues
- European in backward part of ship, say, individual looking dismal
Buddy explains!

The straight part
We know that "Sad" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sad = woebegone.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 WOEBEGONE mean?
WOEBEGONE adjective- In a deplorable state.
- Filled with or deeply affected by woe.