What does the cryptic crossword clue "Performed badly: opening for winning punch missed (5)" mean?

The definition is "Performed badly". The wordplay uses a deletion. HAMMY (deletion) = HAMMY; definition: "Performed badly:" The answer is HAMMY.

Performed badly: opening for winning punch missed (5)

Times Cryptic #28447 | 15 Across | 2022-11-14 flower