The most common and most likely answer to this crossword clue is the 10 letter word RESENTMENT
I've seen this crossword clue in The Times
R
E
S
E
N
T
M
E
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T
More clues leading to the result RESENTMENT
- Freshly dispatched soldiers needing little time to show bitterness
- Army corps posted soldiers east at last, provoking ill feeling
- Bad feeling about despatched soldiers, feature recurrent in battle
- Bitterness to do with feeling one’s ignored
- Dispatched soldiers again – Tony’s main grudge
- Envy soldiers wearing casual shirt after getting posted again
- Posted a second time, intended to be heard, leading to bitterness
- Irritation about setter lacking in thought
- Irritation drove yours truly to break lease
Buddy explains!

The straight part
We know that "Bad feeling" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bad feeling = resentment.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 RESENTMENT mean?
RESENTMENT noun- A feeling of anger or displeasure stemming from belief that one has been wronged by others or betrayed; indignation.
- The state of holding something in the mind as a subject of contemplation, or of being inclined to reflect upon it; feeling; impression.
- Satisfaction; gratitude