What does the cryptic crossword clue "Shots, say, of parent going round topless (4)" mean?

The definition is "Shots, say,". The wordplay uses acrostic. OMMA (reversal="parent") = AMMO; definition: "Shots, say," The answer is AMMO.

Shots, say, of parent going round topless (4)

Guardian Cryptic #29085 | 13 Across | 2023-06-01 flower