The most common and most likely answer to this crossword clue is the 7 letter word PASSION
I've seen this crossword clue in The Daily Telegraph
P
A
S
S
I
O
N
More clues leading to the result PASSION
- Great emotion to overtake one performing?
- Outburst from quiet oaf about maintaining independence
- Die to embrace one love
- Stepson embraces current love
- Powerful emotion as one goes in to die
- Strong feeling includes animated extract from panel discussion
- Die protecting one’s love
- No one’s fool going back for love
- Die without one’s true love
- Minimum goal of student, yours truly, on fire
Buddy explains!

The straight part
We know that "anger" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case anger = passion.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 PASSION mean?
PASSION noun- Any great, strong, powerful emotion, especially romantic love or extreme hate.
- Fervor, determination.
- An object of passionate or romantic love or strong romantic interest.
- Sexual intercourse, especially when very emotional.
- (usually capitalized) The suffering of Jesus leading up to and during his crucifixion.
- A display, musical composition, or play meant to commemorate the suffering of Jesus.
- Suffering or enduring of imposed or inflicted pain; any suffering or distress.
- The state of being acted upon; subjection to an external agent or influence; a passive condition
- The capacity of being affected by external agents; susceptibility of impressions from external agents.
- An innate attribute, property, or quality of a thing.
- Disorder of the mind; madness.
- To suffer pain or sorrow; to experience a passion; to be extremely agitated.
- To give a passionate character to.