What does the cryptic crossword clue "Some fault, a serious shocker! (5)" mean?

The definition is "shocker!". The wordplay uses a hidden word. Hidden in "some faulT, A SERious shocker!" The answer is Taser.

Some fault, a serious shocker! (5)

Telegraph Prize Cryptic #3014 | 24 Across | 2019-07-28 flower