The most common and most likely answer to this crossword clue is the 5 plus 1 plus 3 letter word THROW A FIT
I've seen this crossword clue in Financial Times
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More clues leading to the result THROW A FIT
- Have kittens in small blanket, one put in at the back
- Formula for getting fat — I lose it
- Express extreme anger with a female, Italian, after short fling
- Become angry? What for? It’s mad
- Spoiling for what thing to get mad about
- Become very angry in bar and knock over a fellow after argument
- Have a tantrum if that row needs straightening
Buddy explains!

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.